I have domains on two servers: example.edu.au and example.camp
When I try and send an email (through Exim, SMTP) from [email protected] to [email protected] 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 ** [email protected] R=dnslookup T=remote_smtp H=mail.example.edu.au [45.56.85.76] X=TLS1.2:RSA_AES_128_CBC_SHA1:128 CV=no: SMTP error from remote mail server after RCPT TO:<[email protected]>: 550-Verification failed for <[email protected]> 550-Unrouteable address 550 Sender verify failed
[email protected]
is valid. I can send and receive emails fine in 99% of cases. Only when sending an email from this address to an address on my second server does the sender verify fail.