The following are functions that are bypassed on the Messaging Gateway when items are added to Local Good Senders or Internal Mail Hosts:
NOTE: Senders in the Symantec Global Good Senders, Local Good Sender IPs, and Third Party Good Senders groups are always assigned to the best class (Class 1). Senders in the Symantec Global Bad Senders, Local Bad Sender IPs, and Third Party Bad Senders groups are always assigned to the worst class (Class 9).
NOTE: Internal Mail Hosts supersede Local Good Sender IP's. If an IP is both in Local Good Sender IP's and Internal Mail Hosts, the items that are in Local Good Sender IP's are not bypassed, just the items in Internal Mail Hosts are bypassed.
Adding an IP to internal mail hosts will bypass the first two options for DNS Validation:
1. Reject connections where no reverse DNS record exists for the connecting IP address
2. Reject connections where the reverse DNS record exists for the connecting IP address, but the 'A' or 'AAAA' record of the resulting domain does not match the connecting IP address