Setup
Things most mail servers demand/require to ensure delivery:
- rDNS of sender IP matches sender domain and/or SPF record
- SPF record allows mail server to send mail for domain – see: wwwhttp://en.wikipedia.org/wiki/SenderPolicyFramework
- Setup DKIM/DomainKeys on DNS server + email server – see: our guide for DKIM and Postfix
Test
Send emails to either (or both) of these emails to test SFP records & other things