On Dec 9, 2009, at 3:24 PM, John Levine wrote:
An MTA providing a junk/spam reporting function might choose to keep
[a copy of] all messages for at least a few days so that UIDLs refer
to messages available to the MTA.
It's a reasonable thought, although the POP spec says quite clearly
that once the message is deleted from the server, the UIDL is no
longer valid. It'd be a significant change to POP.
This is the same as with the IMAP server. If a message is deleted from
the server it can no longer be reported to that server as junk. When
the user configures junk reporting on the MUA, the user would get
notice of this requirement and can configure the retention period
which is also a function of the MUA.
MTA's may take a more active role in pre-filtering the users mail and
flag messages as junk before the MUA downloads the message content.
MUAs that take advantage of this capability would download only select
headers of such flagged junk giving the user control to download the
full message or letting the MUA delete the messages from the server
after a configured time has elapsed.
-- Dan Oetting
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