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Hello 

Keep getting this message: 

The mail server does not understand the RCPT TO command. Reason: 550-Cannot send a message as [email protected]. Please send as
550 [email protected].


I have tried to tell the guys that are setting this up for me that .co.uk is using Outlook 365 and they are blaming the server 

Many Thanks
Davide
Not exactly sure what the problem is here?