Rule History

SID: 2100567 • Source: et/open

Versions (3)

Version DetailsCurrent

Rev: 12 • Sep 23, 2010, 12:00 PM

Message:

GPL SMTP SMTP relaying denied

Rule:

alert tcp $SMTP_SERVERS 25 -> $EXTERNAL_NET any (msg:"GPL SMTP SMTP relaying denied"; flow:established,from_server; content:"550 5.7.1"; depth:70; reference:arachnids,249; reference:url,mail-abuse.org/tsi/ar-fix.html; classtype:misc-activity; sid:2100567; rev:12; metadata:created_at 2010_09_23, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)

Created:

Sep 23, 2010, 12:00 PM

Updated:

Jul 26, 2019, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Oct 2, 2025, 10:34 PM

Filename:

rules/emerging-smtp.rules