Use the "Ban User" control to block spammers, offensive commenters and/or those who violate your commenting policy. This will block the user from posting future comments and give you the option to retroactively delete their comments from the past 30 days.

Adding users to your Trusted Users list will ensure that their comments are not caught as Spam, though they'll still be held for review if they violate any of your moderation rules or contain a word from your Restricted Words list. This is used for trusted commenters, such as community regulars or website staff who aren't listed as moderators.
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 While banning users is immediate, retroactive deletions may take up to 24 hours to complete.

Click the three dots in the upper right corner of the comment, and then Ban User.
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Expand the comment, then click Trust User or Ban User.
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 If you select Ban User, you’ll see options to either remove the user permanently, Shadow Ban, or give them a Timeout.
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 **Shadow Ban and Timeouts are Pro level features. Check the links above for more information!

If you're moderator with 'Settings' permissions, you can add a commenter's username, email address, and/or IP address directly to your forum's master Banned User or Trusted User list.

Email domains like example.com can also be banned/trusted at Settings > Access Control by selecting Domain in the Add item > Type dropdown.

Keep in mind: Banning an email domain will block anyone using that domain from posting comments to your site, whether intentional or not. For example, banning the gmail.comdomain will block all users with an email address ending in @gmail.com from posting comments to your site. When possible, we recommend blocking individual users before blocking domains.

You can search your Trusted/Banned Users lists at Disqus Admin > Community > Banned Users.