sendmail, 4th Edition

Chapter 7, How to Handle Spam

The Local_check_ Rule Sets on page 252	HTTP proxy commands immediately cause the server to drop the connection (8.14)
Local_check_relay and check_relay on page 252	Macros which, when defined in check_relay, are maintained for the entire SMTP session (8.14)
FEATURE(dnsbl) on page 261	The dnsbl feature can now also discard or quarantine (8.14)
FEATURE(dnsbl) on page 261	The dnsbl feature now uses the dns database-map type (8.13)
FEATURE(dnsbl) on page 261	The DNSBL_MAP_OPT macro tunes the dnsbl DNS lookup (8.13)
FEATURE(enhdnsbl) on page 263	The enhdnsbl feature can now also discard or quarantine (8.14)
The access Database on page 277	The relaytofulladdress keyword for the access database (8.14)
Rejection Message for REJECT on page 283	The confREJECT_MSG m4 macro no longer inserts quotation marks (8.13)
The check_eom Rule Set on page 258	The check_eom rule set reviews the message’s size (8.14)
FEATURE(badmx)—V8.14 and Later on page 291	The badmx feature rejects clients with bad MX records (8.14)
FEATURE(block_bad_helo)—V8.14 and Later on page 292	The block_bad_helo feature rejects clients with a bad HELO/EHLO hostname (8.14)
FEATURE(greet_pause)—V8.13 and Later on page 293	The greet_pause feature protects from SMTP slamming (8.13)
FEATURE(greet_pause)—V8.13 and Later on page 293	Log the time after which the greet_pause feature triggered (8.14)
FEATURE(greet_pause)—V8.13 and Later on page 293	Do not invoke greet_pause if already ...