email relaying denied

I tried to set up a Gmail forward for newsletters, but gmail’s verification emails are bouncing:

From: Mail Delivery Subsystem <>
Subject: Delivery Status Notification (Failure)

Delivery to the following recipient failed permanently:


Technical details of permanent failure: 
Google tried to deliver your message, but it was rejected by the server for the recipient domain by [].

The error that the other server returned was:
550 5.7.1 Relaying denied

1 Like

Looks like it was related to this morning’s outage. All is well now and I confirmed that newsletters are being delivered successfully.