Hello,
I run Plesk 12 on Centos 5.5.
When I check on MXToolbox, it shows my servers has a SMTP Reverse DNS Issue.
Here are details:
1. SMTP Banner check on MXToolbox output is:
SMTP Banner Mismatch
2. Result of telnet mail.example.com 25 command output is:
Trying **.**.**.***...
Connected...