Error 553


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We have ntoiced the past two days that one of our office staff members cannot seem to send email to anyone at our location. Even from his office computer. The emails are always bounced back with the following example of the error:

<email address>

Permanent Failure: 553_sorry,_your_envelope_sender_has_been_denied_(#5.7.1)

Delivery last attempted at ....

We have tested his computer in the office, he can recieve email fine and send it to anyone except the office. It always seems to result in the above error msg. We are wondering what is causing this, and how to fix it. Help would be much apprieciated.

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