We have SBS 2003, I just switched our ISP provider. We can send and receive mail for the most part with the exception of sites like hotmail, yahoo, etc.
We get the error: you do not have permission to send to this recipient. For assistance, contact your system administrator.
<mail.domain.com #5.7.1 smtp;550 5.7.1 <email@example.com>... Relaying denied. Proper authentication required.>
For example, we have our setup up is like this:
FQDN setup as: mail.domain.com
MX record is: mail.domain.com pointing to 22.214.171.124
PRT is: 126.96.36.199 pointing to mail.domain.com
When i test domain.com on the mxtoolbox site, I get this: SMTP Reverse DNS Mismatch Warning - Reverse DNS does not match SMTP Banner.
Obviously 188.8.131.52 is the new IP address I had changed. What else am I missing here that I am getting the relaying errors?