Mail sent from a daemon on my server connecting to exim4 daemon light using SMTP seems to be being frozen. In the exim4 log:
2014-10-01 09:52:19 1XZKKJ-00049R-8p <= firstname.lastname@example.org H=localhost (server.example.com) [127.0.0.1] P=esmtp S=9492 014-10-01 09:52:22 1XZKKJ-00049R-8p ** email@example.com R=dnslookup T=remote_smtp: SMTP error from remote mail server after RCPT TO:<firstname.lastname@example.org>: host somewhere.com [18.104.22.168]: 550-Verification failed for <email@example.com> 550-No Such User Here 550 Sender verify failed
I think this is saying exim4 rejected the sender's, i.e. the from email address? Exim4 is running on server.example.com and I am using firstname.lastname@example.org as the sender which does not exist - it worked in the past. I had to recently re-do domain records on example.com but they are all OK now and have percolated out (they were done days ago).
I think I have the same issue as here: http://help.directadmin.com/item.php?id=59, but cannot try the solution as cannot find exim4 configuration file is - there are many under
/etc/exim4/conf.d (I just ran
dpkg-reconfigure exim4-config when I installed exim) and the documentation says there is just one? Also how was it working before?
I am prepared to allow any sender - the firewall blocks external access to exim and I am only using it to send mail from my own daemon.
UPDATE Sending to other email addresses works, just to particular one (that is certainly valid) does not - which is weird because exim says it is problem with sender not recipient?!