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Just tried to send through Yahoo Mail and received a similar message:
Message from yahoo.com.
Unable to deliver message to the following address(es).
<*****@*********.co.uk>:
**.**.**.* does not like recipient.
Remote host said: 501 This system is not configured to relay mail from ,**********@yahoo.co.uk> to <*****@********.co.uk> for ***.***.***.**
Giving up on **.**.**.*.
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