Unable to send emails using Plesk local mail server: Connection timed out or connection refused. (#4.4.1)
SELinux is preventing /usr/libexec/dovecot/auth from 'write' accesses on the file passwd.db
Mail quota warnings are not sent
Link to http://www.openspf.org/ returned by Plesk server when SPF validation is failed does not work
Unable to configure External SMTP Server with a non-email address login in Plesk: Unable to encode IDN email address 'jdoe'
CVE-2019-12094 and CVE-2019-12095: Horde vulnerabilities
Plesk email account via Outlook IMAP/POP3 returns the following after syncing: Message appears to be a Unicode message and your E-mail reader did not enable Unicode support.
Connection is broken with Qmail, DNSBL over 465 TLS is used: Failed to send some messages - javax.net.ssl.SSLProtocolExpeption:SSL handshake aborted
Unable to send email using PHP mail after Plesk update: Your server might not be configured to send mail using this method
Horde Inbox does not display any email: IMAP error reported by server.

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How to enable Postfix debug mode

Updated October 09, 2019 05:57

Applicable to:

Plesk for Linux

Question

How to enable Postfix debug mode?

Answer

Login to the server over SSH
Execute the following (specifying the required IP addresses and/or recipient domain names to monitor instead '203.0.113.2' and 'example.com'):

# postconf debug_peer_level=4

# postconf debug_peer_list=203.0.113.2,example.com

Note: No spaces between values in debug_peer_list are allowed.

To disable debug, run:

# postconf debug_peer_list=""

OR

Edit the /etc/postfix/master.cf config file, add -v right after "smtpd" in the file, like the following:

CONFIG_TEXT: smtp inet n - n - - smtpd -v
Apply the new settings:

# service postfix restart

Additional information

Postfix Debugging Howto

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