Had an odd transient bounce from an email server that’s used for a small 
consulting company. The email server is low volume, and hosted on AWS. Bounce 
message is:

host primary.us.email.fireeyecloud.com[165.254.91.98]
  said: 550 5.5.4 ETP212 Your DNS <redacted>.com is listed by Newexist. -

The other odd thing is that primary.us.email.fireeyecloud.com is not listed as 
an MX for the receiving domain.

Google doesn’t return anything that seems to do with email when searching for 
fireeye newexist.

Anyone know what happened here?

—Chris
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