... obviously there are a couple of new config values in 6.0.4 which haven't been there before. I searched the Wiki, Release notes etc. for any hint regrading the changes made to IMAP- Handling to no avail.
So I'm just wondering if and where such things are documented for further reference.
Increasing imap_max_request_size to 1 MB solved the problem for me.
It still leaves the question why this error occurs with TB3 only?
Does anybody know what the (internal) value of imap_max_request_size has been before 6.0.4 (if any)?