- Plesk Onyx for Linux
Note: This article has the reference to the issue with the fix available:
"Mail headers of emails retrieved from a Plesk server via Outlook were blank if “DKIM spam protection” was enabled on the server."
- Plesk Onyx Update 8 28 November 2016 (Linux)
In Plesk Onyx mail accounts configured in Outlook have blank subject and the message body contains the full message header.
Courier-IMAP is used on a server.
This is an internal issue with ID #PPPM-5070 , which is planned to be fixed in future product updates.
Use one of the following workarounds:
1. Disable incoming mail verification in DKIM spam protection in Tools & Settings > Mail Server Settings > Verify incoming mail
2. Switch from Courier-IMAP to Dovecot in
Tools & Settings > Mail Server Settings > install and use another IMAP/POP3 server > select Dovecot.
if any purchased SSL certificates were installed in Courier-IMAP, they should be moved to Dovecot:
# cp /etc/courier-imap/courier.pem /etc/dovecot/private/ssl-cert-and-key.pem
Otherwise, the default Plesk ones will be used.
For additional information about Dovecot check Plesk Administrator Guide .