I Just Added a MX Record and I Cannot Receive Email

Additions of a new MX Record can take up to 5 minutes. It is advised to not try to send any mail until this time period has passed. Some mail servers might cache the old mail record, which will take additional time.

If sufficient time has passed and you are at the same location as the mail server, a www.portchecktool.com simple port check test on SMTP port 25 may also help diagnose the problem.