If pop3_uidl_format=%m, add a unique X-Delivery-ID header to all saved mails. Without it it's possible to get duplicate UIDLs which some clients don't handle all that well. (eg. mail sent to two accounts where one is alias to another will get the exact same Received/Delivered-To headers with Postfix)
If pop3_uidl_format=%m, add a unique X-Delivery-ID header to all saved
mails. Without it it's possible to get duplicate UIDLs which some clients
don't handle all that well. (eg. mail sent to two accounts where one is
alias to another will get the exact same Received/Delivered-To headers with
Postfix)

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