[Pkg-exim4-users] smtps support in Stretch

[J G Miller]

At 09:43h, on Wednesday, April 13, 2016,
in message <570E4CE4.7010207 at torfree.net>,
on the subject of "Re: [Pkg-exim4-users] smtps support in Stretch",
Gary Dale reported:

 > 2016-04-13 09:15:33 1aqKdj-0007Qm-Po == gary at dalefamily.org
 > R=dnslookup T=remote_smtp defer (-44) H=mx2.r4l.com [192.99.3.191]:
 > SMTP error from remote mail server after RCPT TO:<gary at dalefamily.org>:
 > 450 4.7.1 Client host rejected: cannot find your hostname, [108.63.184.104]

Well that would appear to be your problem -- the remote mail service is
refusing to accept your mail because it looks like it is trying a
reverse name look up on 108.63.184.104 and failing, even though

  host 108.63.184.104

  104.184.63.108.in-addr.arpa domain name pointer host-108-63-184-104.static.primus.ca.

See

  <http://serverfault.com/questions/654462/450-4-7-1-client-host-rejected-cannot-find-your-hostname>


Also for exim4 configuration for SSL connecton upstream you should have a look at

  <http://askubuntu.COM/questions/167043/how-do-i-configure-exim4-to-send-mail-through-a-password-protected-ssl-smtp-mail>

especially if your ISP provided e-mail server allows use of port 587 as well as 465.