On Wed, 2014-09-03 at 10:22 -0600, Zan Lynx wrote:
> On 9/3/2014 5:45 AM, Pete Biggs wrote:
> > I've never heard of a problem of IMAP duplicating emails and, knowing
> > how the protocol works, I can't see how it can!
> 
> The protocol won't, but servers and clients will.
> 
> I've had Thunderbird (old version, now fixed) time out while copying 
> large numbers of email messages from one folder to another. This 
> resulted in copies of the message in both folders, because it didn't 
> delete the messages until the copy was complete.
> 
> I've also had the server lose delete flags on abnormal client shutdown, 
> which means that messages copied to another folder get resurrected, 
> resulting in two. And when the filter runs again on next client startup, 
> more copies are created.
> 
> So yeah, IMAP can make copies happen.

No, IMAP can't - there's nothing in the protocol specification that
would lead to a duplication of emails.  The implementation of the
protocol is a different matter - in fact the problems you mention are
totally protocol independent.  Bad things can happen when using IMAP but
they aren't necessarily IMAP's fault.

P.

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