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Have a look on this article Simple Mail Transfer Protocol: The Simple Mail Transfer Protocol (SMTP) is a communication protocol for electronic mail transmission. As an Internet standard, SMTP was first defined in 1982 by RFC 821, and updated in 2008 by RFC 5321 to Extended SMTP additions, which is the protocol variety in widespread use today. Mail servers ...


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I have same issue with some differences. I am in the middle of investigation, my up to now findings: I do not use wildcard certificate, I have Let's Encrypt certificate with SANs. It had worked for several months, three renews were done without any issue. Now, after the fourth renew SMTP stopped working. The last working certificate was issued on 2020-07-28,...


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One way is to use the ClamAV milter. Scan outbound messages in the usual way, e.g. smtpd_milters = unix:/var/run/clamav/clamav-milter milter_default_action = accept In the milter config, set MaxFileSize 10M AddHeader Replace If the milter rejects the message, processing continues. But the X-Virus headers will be different. You can then use this header, ...


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You attempted to send a message (to someone presumably running exim) that was not formatted according to standard line length limits. Discussion of the upper limit can be found in RFC 2822 Section 2.1.1, TL;DR: [do] not to create such messages. Your solution is to find the software that created or transformed the message into exceeding this limit, and make ...


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You don't need to have ssh with local port forwarding running on your own. Both mutt and Neomutt have config option tunnel. mutt docs neomutt docs tunnel Type: string Default: (empty) Setting this variable will cause mutt to open a pipe to a command instead of a raw socket. You may be able to use this to set up preauthenticated connections to your IMAP/...


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I also had a similar issue with my organization's Domain accounts. The solution is to enable SMTP authentication in account settings -> Account -> Send -> Authentication then enter the userID and password. Then under SSL/TLS check use SSL/TLS on both IMAP and SMTP , then check the two boxes under advanced for SMTP and IMAP ports. Also, don't forget ...


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Hi if you want logwatch send mail using smtp account you can use package msmtp (debian) and configure logwatch to use it, it send smtp authenticated mail as result. You dont need postfix, setting itself dont affect existing MTA configuration in system. Step 1 : install and test msmtp apt-get install msmtp configure it by create config file in user home ...


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OK, I was able to get authentication working by adding the following lines to the postfix main.cf config file: smtpd_sasl_path = private/auth smtpd_sasl_type = dovecot smtpd_sasl_auth_enable = yes


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As Tero Kilkanen was so nice to answer my question, i can provide you hopefully with an minimal working example. Preconditions: IP forward has to be activated (check with sysctl -a | grep forward) on remote server both server must be in the same network Your different server must have the remote server as default gateway (Is this possible in your case?) ...


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In my case was because selinux didn't allow apache (PHP) to send emails. Fixed with: setsebool -P httpd_can_sendmail=1


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