Multiple Email Errors

Simple Mail Transfer Protocol (SMTP) errors can be associated with a range of issues. A large number of 400-level errors could indicate misconfigured email applications or spam botnet activity. Spam emails are often part of a phishing campaign to collect sensitive information, such as usernames and passwords. A large number of 500-level errors could indicate problems with an email server, or a potential brute force attack, which can help an attacker obtain valid email server credentials.

The system might change the risk score for this detection.