- Plesk 12.5 for Linux
- Plesk Onyx for Linux
- The following mail settings are turned on: Allow signing outgoing mail and Verify incoming mail in Tools & Settings > Mail Server Settings on sending and receiving mail servers.
- Use DKIM spam protection system to sign outgoing email messages is enabled in Home > Domains > example.com > Mail Settings.
- /var/log/maillog on receiving server contains the following error:
CONFIG_TEXT: DKIM verify result: DKIM verification failed: signature verification failed
If update is not possible for some reason you may try the following
The bug was fixed in Plesk Onyx Update 6.
Install the latest Plesk updates.
Also, for Plesk Onyx 17.0 on Debian 8.6 the following workaround can be applied:
Connect to the server via SSH
Download the hotfix for Plesk Onyx 17.0.17:
# cd /root
# wget https://support.plesk.com/hc/en-us/article_attachments/115004356765/dk_sign
Backup the file
# cp /opt/psa/handlers/hooks/dk_sign /opt/psa/handlers/hooks/dk_sign.orig
Replace the original file with the downloaded one:
# mv -f /root/dk_sign /opt/psa/handlers/hooks/