I have domains on two servers: example.edu.au and example.camp
When I try and send an email (through Exim, SMTP) from firstname.lastname@example.org to email@example.com I get a bounced email with "Sender Verify Failed".
What could be causing this Sender Verify to fail, when the email is coming from one of my servers to the other server? How could I troubleshoot this?
I can send from example.edu.au to example.camp with no problems. Other than this specific example, I can send and receive from both these emails without any trouble.
2017-01-24 23:39:11 1cWAg0-0000qw-MZ ** firstname.lastname@example.org R=dnslookup T=remote_smtp H=mail.example.edu.au [18.104.22.168] X=TLS1.2:RSA_AES_128_CBC_SHA1:128 CV=no: SMTP error from remote mail server after RCPT TO:<email@example.com>: 550-Verification failed for <firstname.lastname@example.org> 550-Unrouteable address 550 Sender verify failed