I am posting this to the List on behalf of Dr Fulcieri Maltini 11290 Alairac - France who is unable to post to the List , because his post was "rejected by the webmaster a couple of times for unclear reasons". As you see, he has some severe email problems with his MacBook Pro (and his iMac and iPhone). Hopefully someone can give him some clues / hints.... 1. I have OSX 10.5.6 and Mail 3.5. I have four email addresses into Mail App :fulcierimaltini at mac.com, fulcierimaltini at gmail.com , fmaltini at gmail.com and fulcierimaltini at compuserve.com (I will discontinue this latter next month). 2. When iMac, MacBP and iPhone are on, I receive some emails in one machine but not in the others. To be sure to get all emails (I get dozen a day) I am obliged to switch off two machines and work only with one. 3. Suddenly Mac Mail got mad: I receive all mails in double; when erasing sometimes they go into the in Trash, other times I get a message "The message “PV in Bulgaria” could not be moved to the mailbox “(null) - The destination mailbox “(null)” does not allow messages to be moved to it.". 4. When drafting a mail and saving it in Draft mailbox, this appear three or four times in the Draft mailbox. 5. On gmail apparently emails are not deleted as they reappear entering in the computer again as I see the mailactivity indicator receiving 30 to 150 mails incoming. 6. On the left side column of Mail page where I have several mailboxes, suddenly new mailboxes have appeared (Mobileme with: Deleted messages (empty), Drafts (empty), Sent messages (empty), Sent messages-mobile me (including most of sent messages). Other additional mysterious mailboxes are Gmail and Compuserve both including similar sub boxes as with Mobileme. I admit I have lots of email in the two computers, but I despite having tried to erase most of them and in particular gmail, they reappear again as they were not deleted in the server. I have now 19108 (!!) emails and, more I erase them, more they reappear. I am tempted to dump in the trash the entire Mail App but you may have some better suggestions to solve this mess. By the way, I have Sophos Anti-Virus who detected a couple of viruses that have been disinfected.