Sendmail stopped working

I have a phpBB forum and setup sendmail to send out messages from the board. (I have no incoming mail server set up

It all worked fine until I updated the system I could use evolution on the Alma box to send mail to my normal mail server.

Now, I’m getting the message:
opendkim: error connecting to filter: Connection refused by localhost

Sendmail is running, no error, as is opendkim

Any suggestions?