IT notes

postfix version

In Postfix there is no -v or --vesion, to find the version run: $ postconf mail_version


Find users sending email: tail -F /var/log/all.log | grep -i sasl_username


Smarthost with postfix A smart host is a type of email message transfer agent that allows a Simple Mail Transfer Protocol (SMTP) server to route email to an intermediate mailserver rather than directly to the recipient’s server Setup postfix to forward all emails using an external SMTP server, for example, smtp_sasl_auth_enable = yes smtp_sasl_password_maps = static:username:password smtp_sasl_security_options = noanonymous smtp_tls_security_level = encrypt header_size_limit = 4096000 relayhost = [smtp.