User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.12) Gecko/20050915 Firefox/1.0.7 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.12) Gecko/20050915 Firefox/1.0.7 TB returns 'Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox.' when attempting to download a message with poorly-formed strings from POP3 server. Disk is not full and is not write protected. Other messages in mailbox downloaded fine, but hangs at same message in list every time. Reproducible: Sometimes Steps to Reproduce: 1.Open TB and start download of message 2.Note that first 300 or so of 1000 messages download successfully 3.Observe error message at same point every time Actual Results: Cleared mailbox of 'no subject, no sender, no body' messages via webmail and problem disappeared Expected Results: Downloaded contents of mailbox, junk and all

what version of tb are you using? If 1.0x, you might want to try 1.5 RC1 and see if it's fixed.

*** This bug has been marked as a duplicate of 166111 ***