is true for the first message ever received in an email account (e.g., the first message happens to have a unique id of 0), which is causing the shorter UID code to be bypassed for that first message. I haven't traced through the code, though, so treat this as the wild-ass guess that it is... :-)
Is this easy to get fixed?
No. This occurs due to legacy reasons. Previously long UIDs were used without a courierpop3dsizelist file. In order not to have the UIDs of existing messages rudely changed when upgrading, messages that exist in the mailbox without a courierpop3dsizelist file are assumed to be old messages, with long UIDs.
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