Best wau to rewrite subject line based on FROM address...

Question

Has anyone had experience with re-writing the subject line of a message based on the FROM address? I am trying to accomplish the following:
1) if the FROM address of a message is "[email protected]" and SUBJECT of message is "some special subject" then:
2) rewrite from address to be "[email protected]" and rewrite subject to be "A new subject here".
I've done alot of reading in the docs and on the forums and have come to the following conclusions:
1) I can use sieve filters to filter on the above criteria, but the best i can for processing would be to forward them to some special mailbox, where I would need a program that would actualy read them and perform the mangling, and then resend them to the original recipient
2)Maybe use a conversion channel, passign in the subject via environment variables. I would need to write a shell script that would copy the message, mangle it, and then pass it back to the MTA for delivery?
3) maybe install spam assasin - it seems like it adds extensions to the seive filters that allow mangling of the subject line, but the examples I have seen seem limited to adding a special "tag" to the subject, not replacing it in its entirety.
Can anyone advise me of the right approach to follow? Or let me know that I am smoking crack and there is some other better way to accomplish what I want? For example, is it possible to use procmail to do this?
thanks in advance!
-mike cirioli

Answer 1

Has anyone had experience with re-writing the subject
line of a message based on the FROM address? I am
trying to accomplish the following:
1) if the FROM address of a message is
"[email protected]" and SUBJECT of message is
"some special subject" then:
2) rewrite from address to be "[email protected]" and
rewrite subject to be "A new subject here".
I've done alot of reading in the docs and on the
forums and have come to the following conclusions:
1) I can use sieve filters to filter on the above
criteria, but the best i can for processing would be
to forward them to some special mailbox, where I
would need a program that would actualy read them and
perform the mangling, and then resend them to the
original recipientUntrue. Sieve can replace a header line, if you want.
>
2)Maybe use a conversion channel, passign in the
subject via environment variables. I would need to
write a shell script that would copy the message,
mangle it, and then pass it back to the MTA for
delivery?Sounds like a much harder way to go. Also more costly in terms of performance.
>
3) maybe install spam assasin - it seems like it adds
extensions to the seive filters that allow mangling
of the subject line, but the examples I have seen
seem limited to adding a special "tag" to the
subject, not replacing it in its entirety.While I personally use SpamAssassin, it adds no sieve functions at all. It just gives a "spam score" back to the MTA. Header rewriting is handled by Sieve.
>
Can anyone advise me of the right approach to follow?
Or let me know that I am smoking crack and there is
some other better way to accomplish what I want? For
example, is it possible to use procmail to do this?I've never touched procmail. I suspect sieve is the way to go.
jay
>
thanks in advance!
-mike cirioli