Email, Spam Control, Checking if domain is blocked by Spam Control

How do I find if a domain is blocked from sending to
Our spam control engine uses a domain's reputation score to determine if that domain is a spammer. You can check the domain and/or the IP of the sending server using one of the following reputation services:
If you're not familiar with the 'nslookup' command, you can use to get its IP. Enter the domain name and click [Look it up] to get the IP address, then paste into the Proofpoint URL above. If you feel the domain is blocked in error (false positive) then send an email to and a service administrator from our team will look into the matter and get back to you.


KeywordsSpam Control blocked domain proofpoint ip spf nslookup dns   Doc ID49033
OwnerEmail Relays E.GroupUniversity of Illinois Technology Services
Created2015-03-18 10:22:03Updated2020-12-19 13:19:43
SitesUniversity of Illinois Technology Services
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