- Plesk for Linux
Note: This article has the reference to the issue with the fix available:
- Postfix with SPF is used.
If sending emails to multiple recipients, a lot of the following lines can be found in email headers:
CONFIG_TEXT: Received-SPF: pass (100.example.com: localhost is always allowed.) client-ip=::1; firstname.lastname@example.org; helo=localhost.localdomain;
Also, the following messages can be found:
CONFIG_TEXT: 552 5.7.0 Number of 'Received:' DATA headers exceeds maximum permitted (in reply to end of DATA command)
This is Plesk bug with ID PPPM-3456 which is fixed in Plesk 17.5.3 Update 23.
- Connect to the server using SSH.
Install the latest micro-updates:
# plesk installer --select-release-current --reinstall-patch --upgrade-installed-components