Bug#869480: Support multiple smarthosts (gmail support)

[Osamu Aoki]

Hi,

This is an improvement on my multiple smarthosts patch proposal.
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=869480

I thought about ssh pipe transport problem a bit more and created
improved code and tested it.  It is not documented in main document yet
but you can see it in debian/README.ssh (source) or
/etc/exim4/ssh/README.ssh (as instaled).

Script example and guide for permission problem are documented.

 Updated: https://github.com/osamuaoki/exim4-debian-pkg
 (New patch for SSH attached)

With this setup, it is very unlikely to be falsely flagged as spam.

As for same_domain_copy_routing concern raised in bug #750122, my
submission router uses default value of "false" (unlike smarthost
setting it "true") and may give impression of some concern.

I realize my patch doesn't suffer as badly since I implemented this with
the backward compatibility.  You can still use good old smarthost
mechanism using same_domain_copy_routing efficiently when needed.

So if one dare to run mailing list on your desktop machine with
smarthost arrangement, this doesn't kill performance.  This s because ML
mails should have random From header which will not be dealt by the slow
submission or ssh routers.

Also, since we are not talking about internet site, speed advantage for
dnslookup_relay_to_domains, and dnslookup are not issue here.  

Regards,

Osamu
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