I have a bunch of email hanging in the queue in my Exchange System Manager. And there is a return email from the recipient server as below:
1. The following recipient(s) could not be reached:
firstname.lastname@example.org on 05/08/2008 10:45
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<rbdml-01.RBDML.co.uk #5.5.0 smtp;550 mail not accepted from blacklisted IP address [220.127.116.11]>
2. The following recipient(s) could not be reached:
Neil Blundy on 05/08/2008 11:57
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<rbdml-01.RBDML.co.uk #5.7.1 smtp;550 5.7.1 18.104.22.168 has been blocked by Spamhaus>
I manage to delisted the IP address from the second (2) problem however i couldnt find the first problem. Where should i lookup for this?