Exim filter check if email is forwarded

mm1234

7/18/24, 9:52 AM

I'm using Exim with Cpanel. I created email forwarding from '[email protected]' to '[email protected]' and '[email protected]' to '[email protected]'.

I want to filter only emails that are forwarded so if a user sends an email to '[email protected]' no thing would happen but on forwarding this email to '[email protected]' I want to filter it.

I can't do that:

if ("$h_to:, $h_reply_to:" contains "[email protected]")

because I don't want to target emails sent directly to '[email protected]'.

I tried to create .forward file in /home/ and in /home/user/ but it's not doing anything.

I created a filter file:

touch /usr/local/cpanel/etc/exim/sysfilter/options/forward_filter

and enabled it I just need the condition to target the forwarded emails only.

0 + 6

exim

mail-forwarding

cpanel

Esa Jokinen

7/18/24, 11:09 AM

Wouldn't it be better to handle this in a *message delivery agent* (MDA) like Sieve or Procmail?

Lacek

7/18/24, 11:18 AM

If the forwarding is done by Exim, you can set any `r_*` variable in the `redirect` driver, and check for that variable in the ACLs (specifically in `predata`, `data`, and `data_prdr`). You can add headers to the message in the ACLs, which makes it trivial to filter the messages later in any MDA. Unfortunately I don't know how to specify all of these when cPanel is involved, but there might be similar settings.

mm1234

7/18/24, 11:19 AM

@EsaJokinen I'm new to Linux servers and I think Cpanel doesn't have any of these MDA. Is it possible to add one of them to work with Cpanel and Exim?

mm1234

7/18/24, 11:22 AM

@Lacek Actually I want to use filters to add/remove headers because forwarding is not working with SES as the sender email has to be verified. So if an email is forwarded from '[email protected]' to '[email protected]' it won't be forwarded as '[email protected]' is not verified with SES as it's impossible to verify all users sending us emails.

Esa Jokinen

7/18/24, 12:41 PM

We don't really deal with web hosting control panels here, so I don't know what's possible. We know about configurating the actual server software. Unfortunately, I know more about Postfix than Exim.

mm1234

7/18/24, 12:59 PM

@EsaJokinen Thanks, I tried to update the headers most of them are updated except `Return-Path` and `Received` SES SMTP still detects the sender email somehow maybe from `Return-Path` although I removed it and added a new one but it exists like 3 times 2 of them from the real sender

Elon Musk

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EN: Exim filter check if email is forwarded

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