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Remote host said: 550 Relaying not permitted

AlisonP

New Pleskian
Hi,

Been having a problem with one of our subscriptions after we change the MX records on the server, The email address has a new mail server and it's not existent on our plesk control panel but since then we can't seem to be able to send any emails to the address anymore and been getting Remote host said: 550 Relaying not permitted when trying.

Why is this happening? Where should I look? Is it possible that the server still looks at the old mailservers (which were on our server) and can't get that these have been changed? How can I stop that?

Thanks
 
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