SurgeMail Archive: Re: [SurgeMail List] UIDL issue in SurgeMail

Subject:	Re: [SurgeMail List] UIDL issue in SurgeMail
From:	Support ChrisP
Date:	21-Feb-2011
On Tuesday 22/02/2011 at 9:31 am, Dan Troxel wrote: I have noticed a situation with (what I believe has to do with) UIDL in SurgeMail (currently running 5.2d-1 – running on a Windows 2003 server). · If an Outlook email client has set their account to “Leave email on server”, using the POP3 protocol, · and if the mbox files are not located on the same server as the SurgeMail executable (mbox is on a large network share, or a NAS device), · for some reason the network share of where the mbox files are located “burps”, such as a switch reboot · while Outlook is checking email through POP3 · once the network share comes back online, Outlook will download all emails from the mailbox all over again. I believe I have tracked this down to the UIDL in SurgeMail. I was looking for detailed information as to how SurgeMail handles UIDL. Does anyone have any detailed information on UIDL, or why this happens? Is there a way to correct it? Is there a patch needed by NetWin to correct the issue? From your description. I'm guessing surgemail sais something like 'there are no emails in this folder' (because it can't find any briefly), then outlook clears it's cache/index and then when the share comes back online outlook would think all the messages were new, even though they would still have the correct UIDLs (we store the uidls as part of the file name so they can't easily go missing) I will do some experiments and see if I can reproduce this - then I can see if there is some way to avoid confusing outlook in this situation. The other solution to consider is using imap, it was designed for this purpose (keeping messages online) and as a result does it much better and more efficiently than POP so may not suffer from such issues. But anyway I will look at the pop issue. ChrisP.

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