Comment 21 for bug 105736

 I had the same issue. And just recently resolved it.

I have tried to connect mutt to the davmail and in mutt configuration file just placed the same lines as was in configuration for gmail and I didn't noticed that they should be different.

So, one of the line was:

set folder = "imaps://localhost:1143" # I just changed imap.gmail.com:993 to localhost:1143

But it is wrong. Instead of imaps should be imap (without 's' in the end!)

Good luck!