User is not local. This means that both your address and recipients address are not locally facilitated by the server, a relay can be interrupted.

Cause

• Used as a strategy for spam prevention.
• Sender and recipient address are not locally hosted by the server, a relay can be interrupted.

Fixes

Step 1: Contact NET

Contact NET Support and ask them to allow you as a certified sender.

Step 2: Email Authentication

Ensure proper email authentication.

Step 3: SMTP Relays

Allow SMTP relays.