I got it with multiple imaptest instances even with current dovecot-1.1 hg tree.
I checked the emails with that UIDs and they are actually truncated. Some things I noted on these mails: - they are all with MIME multipart attachments. - the last multipart attachment is truncated - the truncated last line is not complete - the following line is the beginning of a new mail (From line) without any empty line after the truncated attachment. - in "got too little data: #2 vs #3" 0 <= #2 < #3 (zero included) - Content-Length: #4 is sometimes bigger than both #2 and #3, sometimes smaller. Regards, Diego.