Troubleshooting using Email Server on Debian

Answered 3 years ago (Jun 15, 2021) by Eldernode Staff

Please be aware that if you enable greylisting for the mailbox, the e-mail sent from outside your server does not arrive immediately at the mailbox. I mean you will see in mail log entries of the attempted delivery right away so you see that mail can reach your server. The greylisting entry in file /var/log/mail.log looks something like this:

Jan 02 20:23:12 dns1 postfix/smtpd[16911]: NOQUEUE: reject:   RCPT from mta-out1.inet.fi[62.71.2.194]: 450 4.2.0   <[email protected]>: Recipient address rejected: Greylisted,   from=<****@*****.***> to=<[email protected]> proto=ESMTP   helo=<******.****.***>

Also, it is possible to monitor the mail log in a terminal window as below example:

tail -f /var/log/mail.log

In case the Greylisting is your target, use the following commands:

tail -f /var/log/mail.log | grep Greylisted

Or

grep Greylisted /var/log/mail.log