# Source: https://documentation.mailgun.com/docs/mailgun/api-reference/razor.md

# Razor Error Codes

Razor is Mailgun's reputation system for detecting spammers and
phishers as well as improving deliverability for legitimate customers.
Razor uses a host of signals to algorithmically detect messages that
either look like spam or have been marked as spam, and shut them down.
If your account has been shutdown by Razor, the below table will explain
why Razor has shut your account down and the steps you can take to
reactivate your account.

If you believe Razor has deactivated your account in error, please
contact [Mailgun Support](https://app.mailgun.com/app/support) and
reference the Razor error code you received to speed up account
reactivation.

Code |   Reason

rzr01  | Your domain has been disabled in order to protect your email reputation. Mailgun has detected content that is labeled as spam or a large amount of incorrect email addresses and/or spam complaints. These issues will cause poor deliverability of your emails and need to be resolved before we can enable your account.|
rzr02  | No longer in use.|
rzr03  | Suspicious activity has been detected on your account. Business verification is required.|
rzr04  | Suspicious activity has been reported on your account. Business verification is required.|