Issue Cannot get OpenDKIM to run on Ubuntu 20.04, keep getting socket error!

[zoldos]

Server operating system version

Ubuntu 20.04

Plesk version and microupdate number

Plesk Obsidian 18.0.69 Update #3 Web Pro Edition

I'm trying to get OpenDKIM running on my dedicated Ubuntu 20.04 server. I got it working briefly, then I messed something up. Here are the logs and more details:

May 06 14:51:28 condor2388 opendkim[2800874]: opendkim: /etc/opendkim.conf: /etc/opendkim/TrustedHosts: dkimf_db_open(): No such file or directory
May 06 14:51:28 condor2388 systemd[1]: opendkim.service: Control process exited, code=exited, status=78/CONFIG
May 06 14:51:28 condor2388 systemd[1]: opendkim.service: Failed with result 'exit-code'.
May 06 14:51:28 condor2388 systemd[1]: Failed to start OpenDKIM DomainKeys Identified Mail (DKIM) Milter.
----
systemctl status opendkim.service:

opendkim.service - OpenDKIM DomainKeys Identified Mail (DKIM) Milter
     Loaded: loaded (/lib/systemd/system/opendkim.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since Fri 2025-05-09 17:43:54 CDT; 17s ago
       Docs: man:opendkim(8)
             man:opendkim.conf(5)
             man:opendkim-genkey(8)
             man:opendkim-genzone(8)
             man:opendkim-testadsp(8)
             man:opendkim-testkey
             http://www.opendkim.org/docs.html
Process: 332658 ExecStart=/usr/sbin/opendkim -x /etc/opendkim.conf (code=exited, status=78)

May 09 17:43:54 condor2388 systemd[1]: opendkim.service: Scheduled restart job, restart counter is at 5.
May 09 17:43:54 condor2388 systemd[1]: Stopped OpenDKIM DomainKeys Identified Mail (DKIM) Milter.
May 09 17:43:54 condor2388 systemd[1]: opendkim.service: Start request repeated too quickly.
May 09 17:43:54 condor2388 systemd[1]: opendkim.service: Failed with result 'exit-code'.
May 09 17:43:54 condor2388 systemd[1]: Failed to start OpenDKIM DomainKeys Identified Mail (DKIM) Milter.

All paths are correct, all files exist with correct permissions and groups. I just can't get it to work. I think it's a socket error. Here is my Opendkim.conf file:

Domain                 bloodofsouls.com
Mode                   sv
KeyFile                /etc/opendkim/keys/bloodofsouls.com/default.private
Selector               default
Umask                  002
UserID                 opendkim:opendkim
KeyTable               /etc/opendkim/KeyTable
SigningTable           /etc/opendkim/SigningTable
ExternalIgnoreList     /etc/opendkim/TrustedHosts
InternalHosts          /etc/opendkim/TrustedHosts
PidFile                /run/opendkim/opendkim.pid
OversignHeaders        From
# Milter configuration
MilterProtocol         6
MilterSocket           local:/var/spool/postfix/opendkim/opendkim.sock
MilterSocketGroup      postfix
MilterSocketMode       660

It keeps saying config error on one specific line: MilterSocket, and I just can't get OpenDKIM to initialize.

I went in circles with a coding A.I. for 2 days, I guess I should have stopped when it was working, but then I had another error.

Can anyone help? My server's sent e-mails *are* being delivered, they just aren't being signed. SPF passes, and DMARC passes.

Thanks!!

 

[scsa20]

Why not just use the DKIM built into Plesk? If you really want to use OpenDKIM instead of what's built into Plesk, then you'll probably want to check out Resolved - Connecting OpenDKIM and Milter configuration on Plesk Obsidian as that user outline the process for getting it to work properly.

 

[zoldos]

Why not just use the DKIM built into Plesk? If you really want to use OpenDKIM instead of what's built into Plesk, then you'll probably want to check out Resolved - Connecting OpenDKIM and Milter configuration on Plesk Obsidian as that user outline the process for getting it to work properly.

There are multiple domains/sites on my server. Will the built in DKIM work for just *my* site? I don't want to interfere with the other domains since they aren't mine. I'm the server admin tho.