When you see emails in the queue from <smith@ghfgghfghfghfghcghdcghghfghfghcfghfhfghfghfghfghghhfhfhfgfgh.com> one might be understandably suspicious about whether that's a legitimate domain name or not.

Turns out...

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Whois Server Version 2.0

Domain names in the .com and .net domains can now be registered
with many different competing registrars. Go to http://www.internic.net
for detailed information.

   Domain Name: GHFGGHFGHFGHFGHCGHDCGHGHFGHFGHCFGHFHFGHFGHFGHFGHGHHFHFHFGFGH.COM
   Registrar: GODADDY.COM, INC.
   Whois Server: whois.godaddy.com
   Referral URL: http://registrar.godaddy.com