Newsletter Gmail Forwarding not working?

I have a gmail account and set up auto forwarding for many emails to Newsblur. All of a sudden I started receiving the below error message this morning (I blocked out the newsbulur email address below).

Your message couldn’t be delivered to 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

I have the exact same issue, starting from 8:53 am EDT today

Checking my logs i see that for two hours earlier today, Mailgun was down and all emails were being rejected. Looks like it cleared up two hours ago, so you should be receiving newsletters again now.

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