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553 sorry, that domain isn't allowed to be relayed thru this MTA

When I try to send mail I get the message

"553 sorry, that domain isn't allowed to be relayed thru this MTA (#5.7.1)"

This means you have not been authenticated by our mail server - please make sure you have configured your email client as described in these knowledgebase articles...

• I cannot send email
• How to setup SMTP Authentication

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