Hi,
I have just received my forwarding email back.
Message not delivered
Your message couldn’t be delivered to *****@newsletters.newsblur.com because the remote server is misconfigured. See technical details below for more information.
The response from the remote server was:
550 5.7.1 Relaying denied
Final-Recipient: rfc822; *****@newsletters.newsblur.com
Action: failed
Status: 5.7.1
Remote-MTA: dns; mxb.mailgun.org. (52.70.248.140, the server for the domain newsletters.newsblur.com.)
Diagnostic-Code: smtp; 550 5.7.1 Relaying denied
Last-Attempt-Date: Mon, 04 Sep 2017 03:11:43 -0700 (PDT)
Any idea ?