Signature Detail
Short Name |
SMTP:INVALID-HELO |
|---|---|
Severity |
Low |
Recommended |
Yes |
Category |
SMTP |
Keywords |
Spam |
Release Date |
2014/02/13 |
Update Number |
2345 |
Supported Platforms |
idp-4.0+, isg-3.0+, j-series-9.5+, mx-9.4+, srx-9.2+, srx-branch-9.4+, vsrx-12.1+ |
SMTP: Invalid HELO Value
This signature detects SMTP "HELO" commands with invalid values. This is most commonly used by spammers to hide the sender's IP address. This signature is not recommended for blocking between known trusted MTA's.
References