""ET POLICY Inbound Frequent Emails - Possible Spambot Inbound""
SID: 2002087
Revision: 10
Class Type: misc-activity
Metadata: created_at 2010_07_30, updated_at 2010_09_21
Reference:
Protocol: tcp
Source Network: !$HOME_NET
Source Port: any
Destination Network: $HOME_NET
Destination Port: 25
Flow: established
Contents:
- Value: "mail from|3a|"
Within:
PCRE:
Special Options:
- nocase