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553 sorry, your envelope sender

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http://forums.cpanel.net – I've got a customer that is getting an error sending to a specific domain only as far as we can tell. When I look up the issue it suggests that the MX records are not set up properly but they appear to be fine. Below is the error... I've change the names. The email was sent to the main recipient [email protected] and cc'd to [email protected] Subject: Mail delivery failed: returning message to sender This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent err (HowTos)