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Accepted
Sam
Asked: 2024-10-05 00:05:14 +0800 CST

Postfix cannot access Opendkim Socket

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I have a ubuntu 20.04 server and a domain example.com I installed postfix and opendkim via apt.

In /etc/opendkim.conf I have

Socket local:/run/opendkim/opendkim.sock

The file exists.

$ ls -l /run/opendkim/opendkim.sock
ls: cannot access '/run/opendkim/opendkim.sock': Permission denied
$ sudo ls -l /run/opendkim/opendkim.sock
srwxrwx--- 1 opendkim opendkim 0 Oct  4 21:19 /run/opendkim/opendkim.sock

I added postfix to opendkim group.

$ groups postfix
postfix : postfix opendkim

I also tried reboot by sudo reboot.

When I do this

echo "This is the body of the email." | mail -s "Subject of the Email" [email protected]

But I got this error.

Oct 04 23:58:24 ubuntu postfix/cleanup[52998]: 
warning: connect to Milter service local:/run/opendkim/opendkim.sock: No such file or directory

I took a closer look

$ ps -p 52998 -o pid,comm,user,%cpu,%mem,stime,tty
    PID COMMAND         USER     %CPU %MEM STIME TT
  52998 cleanup         postfix   0.0  0.2 00:00 ?

The user is postfix and it should have access to the socket file, but the system journal says no.

email

1 Answers

  1. Best Answer

    Postfix runs chrooted, so you need to put opendkim socket into postfix chroot.

    Socket      local:/var/spool/postfix/var/run/opendkim/opendkim.sock
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