smtp error: could not authenticate

… Se encontró adentro – Página 892A flaw in the authentication process (CVE, 2001, No. 0504) used by the SMTP service that installs as part of Internet Information Services (IIS) could allow an unauthorized user to authenticate successfully to the service using ... authenticate. Params: Mailer: smtp Constants: No ErrorInfo: SMTP Error: Could not authenticate. Se encontró adentro – Página 550Of course, the IP you see could also be a proxy and not the original sending computer; however, ... ESMTP is much like SMTP, but it forces the client to authenticate before that client is allowed to send e-mail to a server. Hotpot (plugin) Journal (plugin) Lesson. Se encontró adentro – Página 116But we wish it could support more than just Web-based applications. ... Also, all authentication and SSL encryption is handled on the internal server, assuring that there is no transport- or network-layer connectivity between a client ... And I can also send mails. Posts. ALLRIG CERTIFICATION MANAGEMENT SYSTEM. To get it working, I had to go to myaccount.google.com -> "Sign-in & security" -> "Apps with account access", and turn "Allow less secure apps" to "ON" (near the bottom of the page). While you can schedule a call with us b Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. I asked my host provider. In gmass smtp test I am getting “ERROR: No connection could be made because the target machine actively refused it 45.132.242.91:25” this error Stack Overflow en español es un sitio de preguntas y respuestas para programadores y profesionales de la informática. password: mypassword. Jul 20 '16 at 16:01. Hi all IT guys here. I haveadded in my mailgun account details along with api key. 1. ): SMTP Error: Could not authenticate. Still waiting for you reply Mr. Hassan. The error on the debug output is broad and indicates that the plugin is unable to contact the SMTP server, your SMTP settings look correct but you’re still having issues. This can be due to many reasons such as DNS failure, firewall restriction on the server, etc. Username * Password * SMTP Error: Could not authenticate. It is still possible to use an IMAP account, but in order to fix the 'Authentication Unsuccessful' error, you need to have Authenticated SMTP enabled in your organization's settings within Microsoft 365. 1 post • Page 1 of 1. thaterrormessage Site Admin Posts: 5137 Joined: Tue Jul 14, 2020 8:21 pm. ozman26 0 Newbie Poster . ¸ì¸ 하려고 해서. Se encontró adentro – Página 650... the server to pass additional information about the response that cannot be reasonably included in the Status-Line. ... for completion Proxy-Authenticate Included as part of a 407 (Proxy Authentication Required) response Retry-After ... If you want to send and receive AOL mail from another email program, you’ll first need to set up your AOL server settings.. Se encontró adentro – Página 142You check the Database Mail error log and see the following message: The mail could not be sent to the recipients because of the mail server failure. ... The server response was: You must SMTP authenticate before sending ... PEAR::Mail interface, Swiftmailer etc which can help you easily send mail in php using gmail smtp. I would like to have it for the. Or are there any similar expressions? I just updated the below given part in /etc/selinux/config file Estoy tratando de utilizar este plugin pero no se envían correos electrónicos. It should now work. The Username and Password are OK, And I tried in Thunderbird, without any problem. Hosted by Linode. Quiero enviar un correo con la clase PHPMailer pero me da error: Fatal error: Uncaught Error: Class 'SMTP' not found in C:\xampp\htdocs\proyecto\clientes\phpmailer\class.phpmailer.php:1466 Stack … Se encontró adentro – Página 46Unlike SPF or DKIM , CSV does not authenticate the domain sending the message but rather the domain of the e - mail server ... Greylisting This is the deliberate sending of an SMTP 4xx error code ( a temporary error as opposed to a 5xx ... I encountered this problem. Note: If your client or device does not support SMTP authentication, you won't be able to send mail through your client or device using your Sparklight email address. Synchro. may require you to wait a few min, didn't work instantly for me... hit continue twice. SMTP Error! I had the same issue and did all the tips including Gmail setting (e.g. Turn if On. How to Send WordPress Emails Using Gmail SMTP Server. Se encontró adentro – Página 293This measure helps to reduce error probabilities and makes it easier to conduct security checks. Only those network application programs that are absolutely necessary, for example, SSH, DNS, SMTP, and authentication programs, ... IGN. I experienced the same error when configuring the WP-Mail-SMTP plugin in Wordpress. Shared files are not an option for the application running on the Kubernetes platform. I had the same issue and did all the tips with no luck. Se encontró adentro – Página 276When Exim is dealing with a temporary delivery failure for an address that was handled by a driver with ... error applies when a server is listed in hosts_require_auth in an smtp transport , but the client could not authenticate . 2. It is responsible for sending data over the network. $mail->Password = ' por$ch3'; If you still face error in sending email, with the same error message. Right-click on the context menu of your e-mail account and click on “Settings”. System information (as much as possible) Ubuntu Server 16.04, Apache2, PHP Version 7.0.4-7ubuntu2, Joomla 3.5., MariaDB 10 Self signed SSL certificate. SendAsync(String, String, String, String, Object) Sends an email message to an SMTP … But when I use the code on server, it doesn't seem to work: SMTP Error: Could not authenticate. Could not authenticate. Fix: SMTP Error! Possible duplicate of "SMTP Error: Could not authenticate" in PHPMailer – Synchro. But if you only see - 'Apps connected to your account' and 'Saved passwords'. I received this error because of percentage signs in the password. Se encontró adentro – Página 192You could also modify the program so that different message files are used depending on selected criteria ( e.g. ... is not very efficient when sending multiple email messages , since it has to reestablish a connection to the SMTP ... Ok, I wrote an answer of how to do when the 2 step verification is turned on. That app password can be used in your SalesHandy account to connect the email account via SMTP method. But in the first little moment of truth trying to send a mail (3:30 mark), I get an authentication error: Swift_TransportException in AuthHandler.php line 181: Failed to authenticate on SMTP server with username "dianexxxxx@gmail.com" using 3 possible authenticators Try registration again. I'm using PHPMailer in a Simple Script For Send Email's Through office360, and I'm getting an "Unknown Error". Joomla Stack Exchange is a question and answer site for Joomla! ): SMTP Error: Could not authenticate. The idea is to authenticate the user at the POP3 service of the same server and then connect them back to the SMTP. At Bobcares, we resolve such email errors as […] phpmailer发送邮件 SMTP Error: Could not authenticate 错误 www.111cn.net 更新:2013-10-12 编辑:kp12345 来源:转载 今天在使用phpmailer发送邮件时居然提示SMTP Error: Could not authenticate，这个感觉是smtp设置的问题，下面我在网上找到了几种解决办法。 550: Invalid Recipient: Known recipient, LDAP or SMTP call forwarding recipient validation checks haven't returned a valid internal user. Programming Forum . now it says could not authenticate although same code is working fine on my local wamp server and i was working fine on hosting 4 days ago but now on blue host it say SMTP Error: Could not authenticate i am using correct username and password it works fine on localhost please help me out technical question. I’m using PHPMailer in a Simple Script For Send Email’s Through Gmail, and I’m getting an “Unknown Error” (At least for me! But finally when I changed password to something different, for some reason it worked! WP Mail SMTP will also work for you if: SMTP ports are blocked, which is a common problem on some hosting providers and Amazon EC2; You’re using localhost and you want to send email from your site Restart your mail client and try accessing messages in your email client again. If you prefer written instructions, then please continue reading. Why don't the sandworms attack outworlder cities in Arrakis? Home. Is it bad practice to parallel power connector contacts? PREVENT YOUR SERVER FROM CRASHING! How to Solve SMTP: Could Not Authenticate using Gmail + PHPMailer? log into your gmail, you should see an "unauthorized" login attempt, this script, like all the others, is missing a critical piece to force it to basic authentication. But using smtp. Click the option that the activity was yours. Connect and share knowledge within a single location that is structured and easy to search. Se encontró adentro – Página 13Telnet uses public key to authenticate the source of the data. Ans. False Ans. VoIP Commonly Made Error ○ Some candidates are not clear about protocol and they do not understand the concept of different types of protocol. Search: Namelessmc Smtp Error Could Not Authenticate. xXPavoXx. PHPMailer SMTP Error: Could not connect to SMTP host - SOLVED in this tutorial. Discussion / Question . SendGrid continues to retry resending 400 messages for up to 72 hours.500 responses are hard failures that are not retried by our servers. I have not seen the Allow less secure apps section but the App Password. He ejecutado un phpinfo y me sale que OpenSSL support enabled ¿alguna idea de qué puede ser? site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. In that case, users are requested to reach out to their email service provider to get SMTP enabled. Web Development Forum . Contact your administrator. Here is an answer to how to do it: This will solve my “SMTP Error: Could not authenticate” in PHPMailer error. Se encontró adentro – Página 531Thus those methods often involve the difficulty of high false positives error in real applications. ... Thus, it is likely to mis-authenticate valid Smtp traffics following just the standard Smtp network protocol. How bad does your lawyer need to be for your trial to not be fair? The only sample code I found quickly for this seemed to use port 587, but also use “tls” for `SMTPSecure" rather than ssl as you have it. I receive the following error: SMTP Error: Could not authenticate. Why isn't the dictum "something can't come from nothing" a matter of consensus? SMTP Error: Could not authenticate. Se encontró adentro – Página 367Of course , the IP you see could also be a proxy and not the actual machine ; however , the IP is legitimate and ... Extended SMTP ( ESMTP ) The lack of SMTP authentication forced the industry to find new solutions to allow users to ... This method does not block the calling thread and allows the caller to pass an object to the method that is invoked when the operation completes. Gmail uses Port 587 for StartTLS, not 465. The Send Mail Task is quite simple and straight forward in its configuration and use, but it has some inherent limitations for example, first it supports only sending plain text email (doesn't support HTML formatted mail) and second it doesn't support passing username and password while connecting to SMTP server (it only supports Windows authentication i.e. Now the mail goes without any hassle. The following troubleshooting steps helped me. ขอคำชี้แนะด้วยครับ:baa60776::baa60776::baa60776: “smtp error: could not authenticate” is one such problem reported by website owners when using PHPmailer to send emails. The following troubleshooting steps helped me. Let us help you. Se encontró adentro – Página 68Before that can happen, though, E- mail vendors will have to agree on which API to use and what functions it should contain. And this is where the contro- Client Server DaVinci Mai (PC) NetWare MHS QuickMai (Mac) SMTP Mail (Unix) Lotus ... Land Travel to US via Canada by UK citizen. Se encontró adentro – Página 91error , and reduces administration and maintenance time . ... As general rule , e - mail systems not supporting the most important SMTP extensions should not appear on the email backbone because they degrade the quality of service ( QoS ) ... PHPMailer error: SMTP Error: Could not authenticate. Exchange server uses Simple Mail Transfer Protocol (SMTP) to send emails from an email client to the server and vice versa. Here is the global configuration of my mail setting. Se encontró adentro – Página 13Ans. False Ans. VoIP Commonly Made Error ○ Some candidates are not clear about protocol and they do not understand the concept of different types of protocol. Answering Tip ○ Student should learn the all protocols so they could give ... Making statements based on opinion; back them up with references or personal experience. We ran into the same issue on our website. Esta es la lista de capacidades que dice que soporta: 250-TIME 250-SIZE 0 250 HELP There are several ways to fix this error, and here are three commonly used methods. How to set timeout in Account verification through gmail? Showcase; Learn; Themes; Plugins; Mobile; Support. I have fixed :D … I'm using PHPMailer in a Simple Script For Send Email's Through Gmail, and I'm getting an "Unknown Error" (At least for me! SMTP Debug: 2021-01-05 05:42:43 Connection: opening to mail.vitalticks.com:587, timeout=300, options=array() 2021-01-05 05:42:43 Connection: opened 2021-01-05 05:42:44 SERVER -> CLIENT: 220-server.vitalticks.com ESMTP Exim 4.93 #2 Mon, 04 Jan 2021 22:42:44 -0700 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. Official Linux packages by default have services that have access to the shared configuration and network. Solución: Trabajando con PHPmailer deves cambiar SMTPAuth = false By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Errors reported across the Internet. My password has special characters. You don't happen to have special characters in your password that might get transferred wrongly? Try this: or in other sense, before calling the Send() Function. This is not the case for services running in Kubernetes, where services might be running in complete isolation, or only accessible through specific ports. Many email providers allow users to generate an app-specific password and every email service provider has different methods of creating app passwords. :/usr/share/pear:/usr/share/php'), Google SMTP Error: Could not authenticate, PHPMailer ERROR USING GMAIL: Mailer Error: SMTP connect(), Error: SMTP Error: Could not authenticate. http://mail.google.com/support/bin/answer.py?answer=14257 SMTP SSL Type: SSL I know these settings are correct because I have tested them as an SMTP server via GMail and set up the account in Thunderbird to ensure it is all working fine. Guitar - How to switch from clean to hi-gain, Results with short, advanced proofs or long, elementary proofs, Splitting a small file into 512 byte segments changes it, but splitting it in 1k segments doesn't, Open your web browser and sign in to Gmail at. This is strange, as the error pretty clearly points to a username/password error rather than a protocol problem. Gmail will then provide you with options. It's not at all secure. 英文说明:SMTP error, RCPT TO: 550-Your message was rejected by this system and was not delivered. By using gmail setting i can reset the password with ease. Could not authenticate". The problem would persist even when I have 'triple checked' the settings and login credentials, and am able to log in manually using a browser. While connecting your email account through the SMTP method, you may encounter SMTP Error: Could not authenticate error. Search WordPress.org for: Submit Toggle Menu. I'm hesitant to flag this as a duplicate of this almost identical question - but I'm refraining because the issue was a case mismatch, which your code doesn't suffer from. WordPress was unable to send the notification email: There was an issue generating the email in WordPress. It's found in the account settings on the Security tab, Account permissions (not available to accounts with 2-step verification enabled): https://support.google.com/accounts/answer/6010255?hl=en, original link for the answer: https://support.google.com/mail/thread/5621336?msgid=6292199. (the initial password or the new one did not have any special characters), I had the same problem with authentication. Putting your account password directly somewhere in your script is not a good idea, and the correct way to solve this problem and avoid leaking your main account password is to use the App Password. Other components. Could not authenticate. Never again lose customers to poor server speed! Can I use a trap that will kill a character, if the party can either find a creative solution around it or cast Revivify? As you can see your WP site is trying to connect to the SMTP server, but it is refused because of . PHPMailer: SMTP Error: Could not connect to SMTP host, PHPMailer - SMTP ERROR: Password command failed when send mail from my server, Email with php:[SMTP Error: Could not connect to SMTP host]. Here, once when the Outlook download the mails, there is no need to re-authenticate to send mails through SMTP. The best answers are voted up and rise to the top, Joomla Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. SMTP server error: 5.7.1 Username and Password not accepted. Wiki. You have to disable 2-step verification setting for google account if you have enabled. Se encontró adentro – Página 13Commonly Made Error ○ Some candidates are not clear about protocol and they do not understand the concept of different types of protocol. Answering Tip ○ Student should learn the all protocols so they could give correct answer. 4. SMTP Error: Could not authenticate Ejemplo algo más complicado El objetivo de esta segunda aplicación de ejemplo aplicacion2.zip va a ser enviar un correo con un fichero adjunto a 2 direcciones de destino diferentes (al menos debe haber una direccion de destino, el … A simple fix is to break out those assignments before the if statement. Patch incoming. wells created an issue. See original summary. Oops, one additional fix needed to fully resolve this -- the setting of $mailer->SMTPSecure was using a comparison instead of assignment operator. Logged in via Facebook account for the first time on the website. Error: SMTP Error: Could not authenticate. 200 responses are usually success responses, and 400 responses are usually deferrals. SMTP Error: Could not authenticate I'm using PHPMailer in a Simple Script For Send Email's Through Gmail, and I'm getting an "Unknown Error" (At least for me! PHP 5.6.30-12~ubuntu16.04.1+deb.sury.org+1 Drupal :7.54. I have installed the OG Mailinglist module and followed the instructions to get it installed with a Mailgun account. The smtp settings that work for me are, on gmail "Manage your google Account" > Security > Turn on 3rd party app Access, This the new step that i discover by UnlockingCaptcha that told in this, Scroll down and select 'Less secure app access'. Viewed 4k times 2 Here is the global configuration of my mail setting. 2021-01-05 05:42:44 CLIENT -> SERVER: EHLO jasdental.in 2021-01-05 05:42:44 SERVER -> CLIENT: 250-server.vitalticks.com Hello ec2-3-6-131-50.ap-south-1.compute.amazonaws.com [3.6.131.50]250-SIZE 52428800250-8BITMIME250-PIPELINING250-AUTH PLAIN LOGIN250-STARTTLS250 HELP 2021-01-05 05:42:44 CLIENT -> SERVER: STARTTLS 2021-01-05 05:42:44 … Create a new password for the Gmail account you want to use, Sign in using the app or website. For some reason Joomla refuses to negotiate TLS. We have contact our provider but they didn't change anything. More info. GmailのSMTP利用する際には、 Googleアカウントのセキュリティ設定を忘れず、済ましておいてくださいね 「安全性の低いアプリの許可」に逃げず、「二段階認証／アプリパスワード」を使いましょう; というだけの記事です。 SMTP Error: Could not authenticate. If you're 100% sure that everything is OK and that the problem is not because of your host (a firewall setting), then the likely solution is to enable less secure apps. I am using a seperate server to connect to and sending all emails: Thank a lot. SMTP authentication in cPanel allow sending messages via POP-before-SMTP. experimental) for the concept of "normalized power" used in physical endurance training? SMTP Error: Could not authenticate is also one of the errors that may appear for you in the WordPress Newsletter plugin or any other plugins for various reasons. 14 comments Comments. Mail servers and other message transfer agents use SMTP to send and receive mail messages. 2017-12-19 13:06:49 CLIENT -> SERVER: QUIT 2017-12-19 13:06:49 SERVER -> CLIENT: 221 mx.zoho.eu closing connection SMTP Error: Could not authenticate. Current Promotion: Enjoy 15% discount on your next visit!SMTP Error: Could not authenticate. I had the same issue which was fixed following the instructions below, Test enabling “Access for less secure apps” (which just means the client/app doesn’t use OAuth 2.0 - https://oauth.net/2/) for the account you are trying to access. 2020-02-10 16:27:24 CLIENT -> SERVER: QUIT 2020-02-10 16:27:24 SERVER -> CLIENT: 221 2.0.0 Service closing transmission channel 2020-02-10 16:27:24 Connection: closed SMTP Error: Could not authenticate. PHPMailer is a great tool to send emails safely and easily using SMTP authentication. Alternatively you can follow this direct link to these settings, read this Google Help (https://support.google.com/mail/answer/14257?p=client_login&rd=1), I tested it and its working perfectly without no other change. Password not accepted. 5. While connecting your email account through the SMTP method, you may encounter SMTP Error: Could not authenticate error. The solution should be as follows: $mail->Password = "por\$ch3"; Note the Backslash I placed before the dollar character within my password. Please note that you need to use the generated password while connecting your email account with SalesHandy. "Błąd SMTP: Uwierzytelnienie nie powiodło się" means ofc "SMTP Error! Follow edited Feb 6 '16 at 19:48. Se encontró adentroInTempo can't rely on the native Exchange organization data because you may not be running Exchange but some other E-mail ... For example, it uses Exchange to authenticate users and set up rights to the shared folders in which its ... Re: SMTP Error: Could not authenticate by Leo Furze-Waddock - Thursday, 22 November 2012, 3:30 AM I've just set-up Moodle 2.3.3 on Windows Server 2008 R2, IIS7.5, SQL Server 2008 R2 & … Relationship with net/smtp. Thank you. To use the SMTP Transport you need to know which SMTP server your code needs to connect to. You will need to request a regular account for the DoD organization. While you can schedule a call with us b In this article, I review how the .NET SmtpClient can be used and explore an alternative way of sending emails using MailKit. At Bobcares, we resolve such email errors as […] Hoping to be useful let me say I’m happy to see that Phabricator is using PHPMailer to handle SMTP. SMTP Error: Could not authenticate. SMTP Error: connect() failed. [SY6PR01CA0019.ausprd01.prod.outlook.com] SMTP Error: Could not authenticate. Error: SMTP Error: Could not Tema 1. Introducción a Exchange server 2000. Tema 2. Administración de Exchange server. Tema 3. Administración de destinatarios. Tema 4. Administración de los servidores. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Hola @ zest0adam, 06 Mar 2021. I've also Used SSL Authentication and Port 465, getting the same Error. But, sometimes this may fail due to incompatible server settings or incorrect SMTP configuration. The sender must resend the message to a valid internal recipient address. Joined. Google would sent me a warning message that someone has my password and the login was blocked. ای تأیید اعتبار را دریافت می کرد. In one of my test servers I am not able to send emails and received following errors. Find centralized, trusted content and collaborate around the technologies you use most. Is it bad practice to parallel power connector contacts? Se encontró adentro – Página 120Systems administrators often receive calls from users who are receiving consistent error messages , or who don't ... a specifically formatted " HELO " command is not given , messages may not be forwarded correctly , or the SMTP daemon ... SELINUX=permissive (it was SELINUX=enforcing before). Moodle development Solo te toma un minuto registrarte. PoodLL (plugin) Questionnaire (plugin) Quiz. But don’t worry. What material pipe to carry water to a detached garage, Land Travel to US via Canada by UK citizen. With WP Mail SMTP, you can authenticate emails through your Gmail or G Suite account to keep your login details safe and private. @TheHive the same happens to me, had to turn off the 2-step verification. ): SMTP Error: Could not authenticate. Field javaMailSender in com.subex.util.Application required a bean of type ‘org.springframework.mail.javamail.JavaMailSender’ that could not be found. Se encontró adentro – Página 13Ans. VoIP Commonly Made Error ○ Some candidates are not clear about protocol and they do not understand the concept of different types of protocol. 3. Answering Tip ○ Student should learn the all protocols so they could give correct ... SMTP Error: Could not authenticate. Se encontró adentro – Página 367Return-Path The reply address for error messages Mail server Received The date and time the mail server received Mail ... Of course, the IP you see could also be a proxy and not the actual machine; however, the IP is legitimate and ... The only sample code I found quickly for this seemed to use port 587, but also use “tls” for `SMTPSecure" rather than ssl as you have it. Let’s have look on the steps to enable SMTP auth in cPanel server. อพลาดอะไรไปรึป่าวครับ. CLIENT -> SERVER: EHLO mautomotriz.tics-tlapa.com SERVER -> CLIENT: 250-c2.iservidorweb.com Hello mautomotriz.tics-tlapa.com SERVER -> CLIENT: 220 TLS go ahead CLIENT: 535 Incorrect authentication data ERROR: Password command failed: 535 Incorrect authentication data SMTP Error: Could not authenticate SERVER -> CLIENT: 221 c2.iservidorweb.com closing connection SMTP connect() failed. Why does the design of heuristics require considerable domain knowledge? Stack Exchange network consists of 178 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. This's the solution for me. If Brexit is bad for British science, why hasn't the rankings of British universities worsened? Problemas de SMTP de Amazon SES. Re: SMTP Error: Could not authenticate de JHON GONZALEZ - domingo, 4 de marzo de 2012, 18:18 Hermano mil gracias desde venezuela 2 dias sin dormir tratando de arreglar esa misma falla para el lunes y con tu guia pude hacerlo, mil gracias por compartir esta informacion. Could not authenticate. DISA has not figured out a way yet to authenticate the CACs with the newer Root certifications of Root CA3 and Root CA4. Apache And PHP Are properly-Configured (With OpenSSL extension Running in PHP and mod_ssl running in Apache 2.2.16). To learn more, see our tips on writing great answers. Any assistance would be appreciated. php smtp phpmailer. We need to set the mail.smtp.host property with the SMTP server host. The Go standard library provides a SMTP client implementation in net/smtp.However net/smtp is frozen: it's not getting any new features. PHPMailer SMTP is the most popular open-source to send emails. Email Follow-up - SMTP Error: Could not authenticate. Hi, you did the correct thing by contacting your hosting support. 2017-12-19 13:06:49 CLIENT -> SERVER: QUIT 2017-12-19 13:06:49 SERVER -> CLIENT: 221 mx.zoho.eu closing connection SMTP Error: Could not authenticate. Share. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa.