Sender host names must clearly identify their sending identity. When scaling your Mail Transfer Agent (MTA) complexes, you should not overuse the root domain, because this practice raises concerns of spammer-like behavior. Spammers often add characters to their domain names to evade domain-level blocklists.
The following examples show host name naming conventions you should avoid:
- mx.organization.com
- mx.organizationProductA.com
- mx.organizationProductB.com
- mx.organizationProductC.com
- mx.organizationProductD.com
The following examples show host name naming conventions you should use:
- Mx.organization.com
- Mx1.organization.com
- Mx2.organization.com
- Mx3.organizations.com
