HMailServer – SMTP protocol error: 550 Delivery is not allowed to this address.

Problem

You attempt to send emails via HMailServer and receive the following error:

SMTP protocol error: 550 Delivery is not allowed to this address.

 

Cause

Sending emails to the HMailServer from a different host is prevented by default as this could result in spamming.

 

Solution

Go to settings => advanced => IP Ranges =>Internet

Screen Shot 2016-05-04 at 8.23.12 PM

In the Allow deliveries from section check both

  • external to local
  • external to external

 

 

 

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