Cyrus pop3d uses UIDLs with a pattern of "UnixTimestamp.InternalNumber", so the "UIDL" command results in something like this:
[...] 966 1049815830.12154 967 1049815830.12155 968 1049815830.12156
Apparently Outlook and OE have problems with this as they begin getting mail as "new" even if they already have downloaded it ("Leave mail on server").
I activated the telemetry log for a user using Outlook but this shows that Cyrus does things 100% correct. But Outlook and Outlook Express seem to randomly download mail.
It seems that Outlook only uses a fixed number of chars to hold the UIDL, the rest is dicarded. The problem arose when when message-numbers reached 1000. So it seems that Outlook uses 14 or 15 chars. So then for Outlook all messages have the same UIDL, resulting in this behaviour.
Our previous mail system ("Sun iPlanet") used UIDLS as 18328-100938292. So the problem did not arise.
Had anybody the same problem?
We are encouring users to use IMAP4 if they wish to leave mail on the server. Besides this, we did not find a solution. And Microsoft does not reply to an error report.
Pascal
