nopotato

i just bought droid, delighted, but 1 major flaw - when sending mail through non gmail account, the item duplicates itself up to 100 times by the end of day. this occurs both on the server & on the phone. I c that others have remarked upon this elsewhere, but suggestions have not addressed the issue.
I do not think that it is an imap problem or a yahoo problem as has been suggested. i have accounts with 1 & 1, enom, & yahoo, & have created accounts on droid & attempted sending with all of those. Enom uses pop (anyway outbound is smtp?).
i suspect android 2.0 as no one seemed to complain about this until droid came on the scene.
Curiously i noticed that when using the droid & opening the sent folder, it appears that the phone is attempting to load messages continuously. others have complained that their 'outlook' on the computer has become sluggish since using the droid. I have noticed lethargy too!

Help swould be welcomed, as this is a major headache for me, especially as android doesnt seem to have a feature to allow block email selection (subsequently to delete)!.