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Unable to send domain.

Medium Priority
1,226 Views
Last Modified: 2013-12-18
We cannot send to this one domain for ours. If an email is sent then and instant email gets returned saying "Delivery has failed to these recipients or distribution lists".
This is also displayed under the email being sent to: Requested #550 5.5.0 Invalid EHLO/HELO domain. ##

A message was sent to the domain in question from a hotmail account and it got through fine.

Can anyone help with this?
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