The following ip addresses need to be open for inbound SMTP for the mailscanner to work properly:
208.73.136.12
208.73.136.26
208.73.136.50
208.73.136.51
208.73.136.52
63.90.9.6
You can use 208.73.136.0/26 (208.73.136.0 255.255.255.192) in your firewall acl if you prefer.
The MailScanner machines are clustered and have the ability to fail over between them so you need to ensure that all of the above IP addresses are allowed.
From inside the MailScanner you can perform an SMTP connection test to ensure that your firewall is allowing smtp inbound properly:
[Run mydomain.com SMTP Connection Test]
If you get a message like this:
WARNING: Cannot connect to SMTP service at a.b.c.d; timeout: 15 sec.
that means that the MailScanner could not connect and you need to verify your firewall ACLs.
If you have changed the inbound SMTP ip address that your firewall conduits through to your mail server contact Richweb and we will update the SMTP transport database.