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Just started getting "undeliverable" for Plusnet m


Just started getting "undeliverable" for Plusnet m

Sending to valid Plusnet email addresses, I have just started to get bouncebacks like this:

Mail Delivery System
<> to me
More options 16:33 (1 hour ago)
This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
SMTP error from remote mail server after MAIL FROM:<> SIZE=22858:
host localhost []: 503 sender already given


This was in response to an email sent from my gmail account at 11:54 today.

Service status shows email problems today that are fixed - but has something else failed?