Bogus entry in /etc/exim4/passwd.client inefficiently causing '535 Incorrect authentication data' mail failures #53
Description
I've noticed mail sending seems to have two '535 Incorrect authentication data' lines which I see on other mail attempts also. Looks like we issue two bad attempts then the third works.
Mythic Beasts have investigated and replied:
I think this is down to /etc/exim4/passwd.client. This contains:
mx.mythic-beasts.com::so Exim must be trying to authenticate with blank credentials and this obviously fails.
Looking in etckeeper, this was added on the 17th of March, and the file also has a comment to say it's managed by Chef. Prior to this, it was the default file, which is blank except for comments.
I think if you remove this entry, that should make those errors go away.