Sendmail, 3rd Edition

Chapter 4

Section 4.4.1	Previously, the user root was always in the class defined by the EXPOSED_USER configuration macro (V8.9 and earlier). That class is always empty unless you add usernames into it (V8.10 and later).
Section 4.4.5	It is now possible to omit selected hosts from masquerading by defining the MASQUERADE_EXCEPTION or MASQUERADE_EXCEPTION_FILE( ) configuration macros (V8.10 and later).
FEATURE(accept_unqualified_senders)	The accept_unqualified_senders feature causes sendmail to accept MAIL FROM: addresses that are not fully qualified (V8.9 and later).
FEATURE(accept_unresolvable_domains)	The accept_unresolvable_domains feature causes sendmail to accept MAIL FROM: addresses that have host parts that cannot be looked up with DNS (V8.9 and later).
FEATURE(authinfo)	The authinfo feature defines how and where the default SMTP authentication information is stored (V8.12 and later).
FEATURE(generics_entire_domain)	The generics_entire_domain feature allows sendmail to match subdomains in the generics table (V8.10 and later).
FEATURE(local_lmtp)	The local_lmtp feature allows delivery by way of the mail.local program, using LMTP (V8.9 and later).
FEATURE(local_no_masquerade)	The local_no_masquerade feature allows you to suppress masquerading for local-to-local messages (V8.12 and above).
FEATURE(local_procmail)	Two new arguments to the local_procmail feature allow you to specify custom A= and F= equate values (V8.10 and later).
FEATURE(lookupdotdomain) ...