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LED=451 domain not found

365 Distribution List

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#1 Jeff Hughes

Jeff Hughes
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Posted 13 June 2018 - 02:58 PM

We have a Distribution List with external contacts if people from outside the company send mail to this list the forward to the external contact is blocked by Barracuda .... Reason: [{LED=451 domain not found ‎(not relaying for x.x.x.x) 


It eventually times out after about 45 tries.  I can not find this in the Barracuda, this is there error found on the message trace in 365.  Internal emails sending to this distro list work.  Only external emails to the distro list fail.  





Thanks in advance!