Jay Lee wrote:
5. check for new mail via POP
6. compact folder via IMAP
IMAP has no concept of compacting a folder. It's the server's job to
compact folders when neccessary, which in the case of Courier and Maildir,
it isn't neccessary. The MBox format may require compacting.
Right, so "compact folder" menu option (in Thunderbird) is sending an IMAP purge command. This seems logical.
7. check for new mail via POPPOP clients will continue to see the message until the folder is purged,
configure your client to purge immediate rather than just marking for
deletion if possible.
Why show such mail at all via POP3?
It is not until step 6 is completed that the mail does not show via POP.
This is the desired behavior. Get your IMAP client to issue the PURGE.
Let's qualify that by saying who's desires we are talking about, what the desires are and why.
There is the desire to be standards conformant, and to keep the implementation as simple (and hence, hopefully clean) as possible by only implementing the required features. From this perspective, Courier does well.
Then, there is the desire of users for the software to conform to the principal of least surprise. I want to be able to use POP3 or IMAP, and I don't want to have to care about the technical incompatibilities of the protocols, especially if a convention exists for working around the issues.
I think I could demonstrate that every POP3 implementation you care to mention supports the `Status:' header, which is the basis of the workaround I sent to the Debian courier maintainer. Yes, POP3 didn't have a proper way of sending this information, and yes, IMAP does - but if a broken protocol requires a non-RFC mandated workaround, that virtually every client supports, is there a problem with that?
Mozilla Thunderbird, at least, manages not to download all messages every time you click "get mail" with mail kept on server. Is it just keeping track of the message IDs that it has already downloaded, or is there some other trick it's using that should be explored as a better solution to this problem?
Sam.
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