13 and later).
check_etrn ?§19.9.2 on page 706 None needed Allow or disallow ETRN.
check_expn ?§19.9.3 on page 707 None needed Validate EXPN.
check_mail ?§7.1.2 on page 255 Local_check_mail Validate the envelope-sender address.
check_rcpt ?§7.1.3 on page 257 Local_check_rcpt Validate the envelope-recipient address.
check_relay ?§7.1.1 on page 252 Local_check_relay Validate incoming network connections.
check_vrfy ?§19.9.3 on page 707 None needed Validate VRFY.
queuegroup ?§11.4.5 on page 417 See below Select a queue group.
srv_features ?§19.9.4 on page 708 None needed Tune server setting based on connection
information.
tls_client ?§5.3.8.2 on page 214 LOCAL_TLS_CLIENT With the access database, validate inbound
STARTTLS or MAIL From: SMTP command.
tls_rcpt ?§5.3.8.3 on page 215 LOCAL_TLS_RCPT Validate a server??™s credentials based on the
recipient address.
tls_server ?§5.3.8.2 on page 214 LOCAL_TLS_SERVER Possibly with the access database, validate the
inbound and outbound connections.
trust_auth ?§5.1.4 on page 194 Local_trust_auth Validate that a client??™s authentication
identifier (authid) is trusted to act as (proxy
for) the requested authorization identity
(userid).
try_tls ?§5.3.8.4 on page 217 LOCAL_TRY_TLS Disable STARTTLS for selected outbound
connected-to hosts.
Hname:$ ?§25.5 on page 1130 n/a Reject, discard, or accept a message based on a
header??™s value.
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