> What causes double messages?

Can  be  a few things.

There is a known race condition endemic to SMTP conversations in which
prematurely  broken connections between mail servers (due to hardware,
driver,  MTU  or related packet-level issues) can cause messages to be
resent.

A  similar  race  condition  exists  with  POP3  over  slow  or shoddy
connections.

A more common cause is broken MUAs like Outlook which have error-prone
methods of recording which messages (UIDLs) they've already seen.

Sandy


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