Re: sender rewrining advice

On 3/24/24 14:51, none wrote:

this from the webarchive, was always executing the srs rewriting not?
 SEnvFromSMTP
R$+                     $: $>PseudoToReal $1    sender/recipient common
R$* :; <@>              $@                      list:; special case
R$*                     $: $>MasqSMTP $1        qualify unqual'ed names
R$+                     $: $>MasqEnv $1         do masquerading
R$*                     $: $(make_srs $1 $)

I've not looked at what was in the archive in detail in a very long time.
My understanding is that what I saw 15+ years ago and what I'm using checks to see if the envelope from is a local address or not and that it only re-writes the envelope if it's not from a local sender.
I assume that the $(make_srs $1 $) is what's doing the rewriting there. But I believe there was logic elsewhere controlling it.

:) I am not really experienced with m4 nor sendmail. Could that be something like modifying this?

The following are unrelated to SRS.

define(`confCW_FILE', `@LDAP')dnl

I believe `confCW_FILE' is how you specify the file to use for defining the w class which is local host names.
I don't know how the `@LDAP' will fit into that mix.  I assume that there is a way to make that work but I have no idea what it is.

FEATURE(use_cw_file, `LDAP')dnl

This tells Sendmail to look for local host names in a file.  (The confCW_FILE option above specifies what file.)

Would it not be an easy sendmail hack to only allow messages going out that have an envelope domain that matches a domain in this map?

I don't know how easy it would be.  But I do believe that it should be possible to do.
N.B. there is a difference in restricting senders to specified domains vs restricting senders to specified addresses.
The former would still allow user2@example.net to send email as user1@example.net.
--
Grant. . . .