Hi Viktor,
Thanks again.
Just another question.
Should I use it as content filter?
Thanks
Carlo
> On 21 Mar 2017, at 18:38, Viktor Dukhovni <postfix-us...@dukhovni.org> wrote:
>
>
>> 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.
>
