Hello,

I'm trying to configure sendmail to rewrite the sender address for all
emails sent to a specific domain. It's a MAIL2SMS application that has
some kind of authentication based on sender's email address. Basically
I want that all emails sent to address [phone number]@send.sms domain
look like they come from "george@sms".

Other settings: the mx for send.sms domain is added in mailertable, and
it's working.
Another small problem is that I also tried sendmail -f"george@sms"
[phone number]@send.sms, but the sender address is automatically
rewriten as george@sms.localdomain. Anyway, I ditched this version when
I thought about the above version as it is much cleaner.

The system is RHEL 4.3; except for the mailertable thing, nothing was
changed in sendmail config.


Thank you,
George

I got it working based on the info from:
http://www.sendmail.org/~ca/email/lfaq.html#CHGADDR

I created a new mailer specification sendsms.m4:

# cat sendsms.m4
#####################################
### SEND.SMS Mailer specification ###
#####################################

VERSIONID(`@(#)sendsms.m4 0.1 (ca) 1998-09-26')

Msendsms,<tab><tab>P=[IPC], F=CONCAT(mDFMuX8, SMTP_MAILER_FLAGS),
S=sendsms, R=ifdef(`_ALL_MASQUERADE_', `21/31', `21'), E=\r\n, L=990,
<tab><tab>_OPTINS(`SMTP_MAILER_MAX', `M=', `,
')_OPTINS(`SMTP_MAILER_CHARSET', `C=', `, ')T=DNS/RFC822/SMTP,
<tab><tab>A=SMTP_MAILER_ARGS



And I added this to sendmail.mc:

MAILER(sendsms)dnl
LOCAL_RULESETS
LOCAL_RULE_0
R$* < @send.sms. > $*<tab>$#sendsms $@ [10.1.1.1] $:
$1<@send.sms.>$2<tab><tab>This rule sets up the sendsms mailer for
*@send.sms mails


Ssendsms
R$+<tab>$: $>51 $1<tab><tab>sender/recipient common
R$* :; <@><tab>$@<tab><tab>list:; special case
R$*<tab>$: $>61 $1<tab><tab>qualify unqual'ed names
R$*<tab>$: george < @ sms . ><tab><tab>changes the sender address



then, make & make restart.
(Replace the <tab> in the above text with the tab char)


Now, I still have one small problem with the DNS requests. I don't have
a DNS set-up on this server, and even if I did, the send.sms zone is
not configured in any dns server here; so the mail should be sent to
10.1.1.1 and no extra dns-checks should be made, the brackets stop the
mx dns check to be performed. But, it still checks the A record for
send.sms domain (I belive), so I added "10.1.1.1 send.sms" in
/etc/hosts, and it's ok; but is there a way to stop sendmail from
running this A record check ? I want to keep this setup as simple as
possible for duplicating on other servers.

Thanks,
George

georgeav wrote:
> Hello,
>
> I'm trying to configure sendmail to rewrite the sender address for all
> emails sent to a specific domain. It's a MAIL2SMS application that has
> some kind of authentication based on sender's email address. Basically
> I want that all emails sent to address [phone number]@send.sms domain
> look like they come from "george@sms".
>
> Other settings: the mx for send.sms domain is added in mailertable, and
> it's working.
> Another small problem is that I also tried sendmail -f"george@sms"
> [phone number]@send.sms, but the sender address is automatically
> rewriten as george@sms.localdomain. Anyway, I ditched this version when
> I thought about the above version as it is much cleaner.
>
> The system is RHEL 4.3; except for the mailertable thing, nothing was
> changed in sendmail config.
>
>
> Thank you,
> George