sendmail 8.13 Companion

Useful Tables

Two tables are of interest for aiding the suppression of spam:

• Table 7-1 lists the mc configuration features useful for regulating relaying

• Table 7-2 lists the righthand-side values useful in the access database

Relay Features

Several mc configuration features affect relaying. Table 7-1 lists the features that determine how mail will, or will not, be relayed.

Table 7-1. Relay features

Feature	sendmail text reference	Description
access_db	7.5[3ed]	Screen addresses and set policy
loose_relay_check	7.4.2[3ed]	Allow percent-hack relaying
promiscuous_relay	7.4.3[3ed]	Allow all relaying
relay_based_on_MX	7.4.4[3ed]	Relay for any site for which you are an MX server
relay_entire_domain	7.4.5[3ed]	Relay based on $=m
relay_hosts_only	7.4.6[3ed]	Interpret domains in relay-domains and access database as hosts
relay_local_from	7.4.7[3ed]	Relay if SMTP MAIL domain is in $=w
relay_mail_from	7.4.8[3ed]	Relay if SMTP MAIL address is RELAY in access database, and provided the entry is properly tagged

Access Database Righthand-Side Values

The access database was introduced in V8.9 sendmail and improved upon in V8.10. It provides a single, central database with rules to accept, reject, and discard messages based on the sender name, address, or IP number. It is enabled with the access_db feature.^[11]

In Table 7-2, we list the possible access database righthand-side values (which can be keywords or values) and describe the affect each has ...