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Turning to Mastodon for tech support in an effort to save my sanity.

Gmail is rejecting mail forwarded to it. But only *some* of the time.

I own a domain - example.com
It has SPK, DKIM, etc.
It has a catch-all email address.
Any email sent to it is forwarded to a Gmail address.
This works 99% of the time.
But some of the emails aren't delivered - with the reason:

> SMTP error from remote mail server after end of data: 550 5.7.1 [ESA] Sender blocked.

Is that a me problem or a Gmail problem?