Hello Expert Exchange community,
Would appreciate any input on the following issue:
Email gets bounced back with the "554 5.7.1 Relay access denied" when sent from gmail.com to our domain.
Our email hosted internally on Exchange 2010 server behind SoniWall Email Security 300 appliance.
Has tested email delivery from multiple domains with no issues.
Email gets delivered with no problem when tested with TELNET connection to Sonicwall box.