[Imap-uw] x-imapbase timestamp field being rewritten

[Oscar del Rio]

Andrew Tamm wrote:


> For some reason, the X-IMAP field (in particular the first number, the 

> time stamp) is being rewritten to the current time instead of its 

> original value.  This causes all the messages to have new UIDL values, 

> and so the POP client thinks that these are new messages.  The field in 

> question is:

> 

> X-IMAP: 1213219525 0000000002



> Does anyone have any idea why that number would be changing?


SPAM with bogus headers?

We used to have this problem when using Unix mailbox format.
Every once in a while a SPAM comes with bogus headers
(X-UID, X-IMAPbase, etc) and the POP3/IMAP server has to
reindex all messages.

POP3 clients will see every message as new;
IMAP clients will reload all headers - they don't see duplicates but
a delay in "refreshing" the Inbox.

The fix is to either switch to mix format and/or filter out incoming
emails with bogus headers

Our procmail filters remove the following headers
^(X-UID|X-IMAPbase|X-IMAP|X-Status|Status|X-Keywords)