Yes you can do this:
In acl_rcpt:
warn
domains = <YOURDOMAIN>
remove_header = dkim-signature
remove_header = arc-seal
remove_header = arc-authentication-results
remove_header = arc-message-signature
In acl_data:
warn
condition = ${if match {$recipients}{<YOURDOMAIN\\.YOURTLD>\$}{yes}{no}}
condition = ${if !def:h_reply-to:}
add_header = Reply-To: $h_from:
In your redirect router:
sender_redirect:
driver = redirect
domains = <YOURDOMAIN>
data = ${lookup{$local_part}lsearch{/etc/forwards}}
errors_to = $local_part@<YOURDOMAIN>
set = r_orep=${lookup{$local_part}lsearch{/etc/forwards}}
set = r_isfwd=true
In your Remote_SMTP transport:
remote_smtp:
debug_print = "T: remote_smtp for $local_part@$domain"
driver = smtp
dkim_sign_headers = from:date:to:cc
dkim_domain = <YOURDOMAIN>
dkim_selector = <YOURSELECTOR>
dkim_private_key = /etc/exim4/dkim.key
dkim_canon = relaxed
headers_rewrite = *@* "${if eq {$r_isfwd}{true}{$return_path}fail}" fs : *@*
"${if eq {$r_isfwd}{true}{\"Forwarded Email\" <$r_orep>}fail}" tw
This will rewrite envelope sender to the $local_part@<YOURDOMAIN> (by setting
errors_to), then It will rewrite MIME From to $local_part@<YOURDOMAIN>, then it
will rewrite To: to become "Forwarded Email" <[TARGET_ADRESS]>.
It will also dump any DKIM or ARC signatures from original sender, instead you
sign mail yourself.
>>> This will pass servers/senders even with strict alignment. <<<
A forwarded email as this, with forwarded_user having a forward to
"[email protected]" will become:
MAIL FROM: [email protected]
RCPT TO: [email protected]
From: [email protected]
To: [email protected]
Will become:
MAIL FROM: [email protected]
RCPT TO: [email protected]
From: [email protected]
To: [email protected]
Reply-To: [email protected]
(If Reply-To on sending mail is already set, it will not be replaced).
-----Ursprungligt meddelande-----
Från: Mihamina RKTMB via Exim-users <[email protected]>
Skickat: den 5 november 2023 18:49
Till: [email protected]
Ämne: [exim] Handle sender on forwarding
Hi all,
I have an Exim installation where I just setup aliases.
exim.conf:
[...]
local_domains= @:myfoobar.com
[...]
aliases:
[...]
mihamina:[email protected]
[...]
In other words, if I send a message to [email protected], it gets
forwarded to [email protected].
When I test, the sender is [email protected] and the receiver is
[email protected].
The message is effectively forwarded to [email protected], but
the "From:" header is kept to [email protected].
The problem:
GMail rejects the message because my Exim server sends a message with a
"From:" set to [email protected] but atscom.io's SPF does not allow
this server to send such messages.
I have no authority on senders domains SPF (that's fair).
I guess there is a setting I have to set on Exim in order to fix this?
Regards
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