[Mimedefang] test md_check_against_smtp_server

[Fox, Randy]

> You want to:
> 
> 	return ('CONTINUE', 'OK');
> 
> not:
> 
> 	return ('continue', '250');
> 
> It's case-sensitive.
Thanks, I should have caught that.  During my testing, it appears that the sending function only checks the server whose DNS Address record that resolves to $server.  Shouldn't it retrieve the MX record and traverse those addresses first, just like sendmail does?  I looked though IO::Socket::INET and don't even see that as an option so I'm not sure how complex this would be to implement.

Randy