sendmail 8.13 Companion

A Useful Table

There is only one useful table in this chapter, which covers policy rule sets.

Policy Rule Sets

Beginning with V8.8, sendmail calls special rule sets internally to determine its behavior. These are called the policy rule sets and are used for such varied tasks as setting spam-handling, setting policy, or validating the conditions when ETRN should be allowed (to mention just a few). Table 19-2 shows the complete list of these policy rule sets.

Table 19-2. The policy rule sets

Rule set	sendmail text reference	Hook	Description
authinfo	10.9.3.2[3ed]	None	Handle AuthInfo: lookups in the access database
check_compat	7.1.4[3ed]	See discussion following the table	Validate just before delivery
check_data	19.9.1[3ed]	None needed	Check just after DATA
check_eoh	25.5.3[3ed]	None needed	Validate after headers are read
check_etrn	19.9.2[3ed]	None needed	Allow or disallow ETRN
check_expn	19.9.3[3ed]	None needed	Validate EXPN
check_mail	7.1.2[3ed]	Local_check_mail	Validate the envelope-sender address
check_rcpt	7.1.3[3ed]	Local_check_rcpt	Validate the envelope-recipient address
check_relay	7.1.1[3ed]	Local_check_relay	Validate incoming network connections
check_vrfy	19.9.3[3ed]	None needed	Validate VRFY
queuegroup	11.4.5[3ed]	See discussion following the table	Select a queue group
srv_features	19.1.3[3ed]	None needed	Tune server setting based on connection information
tls_client	10.10.8.2 ...