> On Mar 21, 2017, at 12:46 PM, Carlo Poggiarelli <c.poggiare...@gmail.com>
> wrote:
>
> An exchange server sends to postfix an email with multiple addresses
> in the to field. This message should be sent to an sms gateway that
> accepts one address only in the to field. If ti receives an email with
> multiple addresses, it sends the sms message to the first addresses in
> the to field only discarding the others.
The SMS gateway is rather badly implemented. Email must not be routed
based on the content of the To: or Cc: headers. However, if you cannot
repair or replace the SMS gateway, it is possible to work around this in
Postfix.
main.cf:
indexed = ${default_database_type}:${config_directory}/
transport = ${indexed}transport
sms_destination_recipient_limit = 1
sms_destination_concurrency_limit = 2
transport:
sms.example sms
sms.invalid realsms
master.cf:
sms unix - n n - 20 pipe
flags=Dq user=nobody null_sender= argv=/some/script ${sender}
${user}
realsms ...
/some/script:
#! /bin/sh
(
printf "From: %s\nTo: %s\n" "$@"
perl -ne '
BEGIN { $header = 1; $buf = "" }
sub doheader {
print $buf if ($buf ne "" && $buf !~ m{^to:}i);
$buf = "";
}
s/\r+$//
if (/^$/) { header(); $header = 0; }
if (! $header) { print; next; }
doheader() if (m{^\S});
$buf .= $_;
'
) | sendmail -f "$1" -- "$2@sms.invalid"
It remains to define a suitable "realsms" transport. If
that's SMTP, you may also need to apply smtp_generic_maps
to rewrite the envelope recipient back from "@sms.invalid"
to "@sms.example". (Note "sms.example" is not the real
domain to use, replace as appropriate).
Keep in mind you may need to debug and fine-tune this, it is
not a tested or necessarily complete recipe.
--
Viktor.
