Can someone please help me.
When I send emails from my email address firstname.lastname@example.org I receive the following bounces from all recipients which use the domain optusnet.com.au. I do not receive bounces from anyone else who I send emails to. My domain name is maintained by Dyn and is current. What is going on here? Optusnet seems to have 'black-listed' my email address!!
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
host extmail.optusnet.com.au [188.8.131.52]
SMTP error from remote mail server after RCPT TO:<email@example.com>:
521 5.7.1 <firstname.lastname@example.org>: Recipient address rejected:
You are not allowed to send mail. Please see http://csi.cloudmark.com/reset-request/?ip=184.108.40.206 if you feel this is in error.
Optus aren't blocking your email specifically, they are rejecting email from your host because it has a poor reputation for spam. Looking at the details behind the IP 220.127.116.11 is owned by NetRegistry and/or Web Central. So because your email host has a poor rep, Optus is blocking the entire service.
Please refer this matter to your email provider and ask them to review why their server has such a poor rep for spam.