"Karsten W. Rohrbach" <rohrbach(_at_)nacamar(_dot_)net> writes:
to keep the thread up, did somebody, by chance, get any new info on the
"X-UIDL:" header? i looked through some rfc's and pop3 related docs but i
couldnt find anything.
* It's not standardized, and will never be standardized by an RFC.
(No X- header can be)
* Some servers use this to store information for the UIDL command.
* Some clients apparently store UIDL information in this header
in the locally downloaded copy. (Note: the POP3 protocol doesn't
let the client modify the message(s) stored on the server.)
* Some spamming software packages include this header in messages
they send to make some POP3 clients that support client side
filtering think that they've already filtered the message.
* Filtering out incoming messages (pre-retrieval via POP3) seems
'fairly' safe, though some legitimate mail may include this
header. Using it as a heavy weight (but not enough on it's own)
in a procmail scoring recipe that detects spam appears to be
reasonable.
Philip Guenther