Here are a few of the current - open bugs, from https://bugzilla.mozilla.org/buglist.cgi?quicksearch=save+to+sent+failed The second one describes the problem I see periodically. 532886 maj -- Wind nobody UNCO --- Copying sent message to Sent mail folder fails due to timeout during listing folders 556232 cri -- Wind nobody UNCO --- Cannot move a message from a folder to another one.Sent email (or other emails) can't be copied to sent folder. Draft cannot be saved. "There was an error copying the message to the Sent folder. Retry?" 561753 nor -- Wind nobody UNCO --- Error message stating failed to save to sent (using IMAP) 562535 cri -- Wind nobody UNCO --- Won't save in sent message - status bar "Copy failed.", dialog "There was an error copying the message to the Sent folder. Retry?" Don Bosman Information Technologist Professional Libraries, Michigan State University 100 Library East Lansing, MI 48824-1048 517-884-0873 [log in to unmask]