I am currently in charge of a Small business Server 2003 i have exchange server running which accepts mail on port 25.
Now the problem I have is people outside the company are reporting to my users that they can not send mails to our domain they get NDR.
Your message did not reach some or all of the intended recipients.
Sent: 01/06/2006 14:13
The following recipient(s) could not be reached:
firstname.lastname@example.org on 01/06/2006 14:14
The e-mail system was unable to deliver the message, but did not report a specific reason. Check the address and try again. If it still fails, contact your system administrator.
< jess.sift.co.uk #5.0.0 X-Postfix; host mail.nigelherring.co.uk[18.104.22.168] said: 550 5.7.1 Blocked by VOX DNSBL (in reply to RCPT TO command)>
This is only from certain people; 2 in total. Does anyone know what VOX DNSBL is, if so how it works? I am sure this is not a configuration issue on the Exchange server.
Can anyone help?