How can I block someone from emailing us?
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Thankfully, we have an easy way to block it in Desk, through what's called an Inbound Address Filter.
Any Admin on your site can head to Admin → Channels → Email.
Just click on the mailbox that the spammer is emailing to bring up the edit screen. Then enter a comma separated list of email addresses to block into the Inbound Address Filter.
In the example above, emails sent from the email domains @123.com, @spammer.com, @imarobot.com and the email address email@example.com will be ignored by Desk and a case won't be created.
Note: If you want to block an entire domain you should use the syntax ".*@domain.com" as shown in the example.
If that person then resorts to filling out one of your web based forms, you'll need a little more advanced configuration to kill spam the ninja way.