This is a strange one for me.
Whenever I (or a customer) send an email to anyone@optonline.net an immediate failure notification is returned as follows:
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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 error. The following address(es) failed:
addressnamehere@optonline.net
retry time not reached for any host after a long failure period
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I am having this problem from multiple servers all with different IP addresses and ranges. I can send an email to optonline.net via hotmail.
How can I have an immediate failure yet the error message says "after a long failure period"?
Anyone have any ideas?



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