I try to avoid bounce messages by using md_check_against_smtp_server
function.
When I tested I got smtp failure code 5.x.x for all "unkown user" messages,
which is a good sign, but bounce messages still got generated on my
mimedefang_server. How do I discard these "unkown user" messages?
Here's the filter code I use:
sub filter_recipient
{
my($recip, $sender, $ip, $host, $first, $helo, $rcpt_mailer,
$rcpt_host, $rcpt_addr) = @_;
my $relay = undef;
$relay = "internal_server" if ($recip =~ m/[EMAIL PROTECTED]/i);
if ($relay)
{
return md_check_against_smtp_server($sender, $recip,
"mimedefang_server", $relay);
}
return('CONTINUE', "OK"); # accept recipient if dont find relay
}
====================================
from Mimedefang slide:
md_check_against_smtp_server runs the first bit
of an SMTP conversation to see if a local user exists
on another mail server. If you're running MIMEDefang
on a gateway, you can reject messages at the gateway
instead of being responsible for generating a bounce
message
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