One of our users wants to use POP3 with leave-mail-on-server (LMOS). That's great and works well for most people. But for some reason, they MUA (outlook) downloads messages more than once. As the MUA asks for messages, I'm sure it's Outlook's fault, but I was wondering if there is anything that can be done about this on the servern side, or if anyone knows how to fix Outlook.
I'm sending this here, because they report that with non-dovecot servers it does work correctly.
They do not want IMAP, because they want to use Outlook, which cannot support both Exchange and IMAP simultaneously.
This user has multiple accounts, and only for some of them things go wrong. A temporary fix is to remove the mail from the server once, but after a few more messages arrive, the problem starts all over again.
Please help.
Regards,
Juerd