outlook 2016, email delivery

i am getting this error while sending to particular email address
The following addresses had permanent fatal errors ----- <.com>
    (reason: 550 permanent failure for one or more recipients (:blocked))

   ----- Transcript of session follows ----- ... while talking to d132923a.ess.barracudanetworks.com.:
>>> DATA

is this the receipient server blocking or barracuda?
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Edward van BiljonMessaging and Collaboration Technical Lead (Exchange MVP)Commented:

Sounds like a blacklisting issue. Can you verify if your domain is listed? You can go to mxtoolbox.com and see if your ip or ip's are listed and if so then request delisting but you will need to clean up and ensure you not on an open relay. Ensure you have spf, dmarc and your dkim records in place
Saif ShaikhServer engineer Commented:
It's barracuda. When you are sending to a remote domain the remote domain has barracuda as spam filter and it is blocking your email.

Contact the remote domains administrator and inform them to whitelist your domain in barracuda spam filter.

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