'host'' ''''

host

Internal table to store lookup hostnames

V8.1 and above

The host database-map type is a special internal database used by sendmail to help resolve hostnames. It is fully described under the $[ and $] operators in Section 23.4.3.

Only a few database-map switches are available with the host type, and they are listed in Table 23-15.

Table 23-15. The host database-map type K command switches
Switch	§	Description
`-a`	-a	Append tag on successful match
`-d`	See this section	The res_search( ) `_res.retry` interval (V8.12 and above)
`-D`	-D	Don't use this database map if DeliveryMode=defer
`-m`	-m	Suppress replacement on match
`-r`	See this section	The res_search( ) `_res.retries` limit (V8.12 and above)
`-S`	-S	Space replacement character
`-T`	-T	Suffix to append on temporary failure
`-t`	-t	Ignore temporary errors

The -D database switch should probably always be used with this type on sites that have dial-on-demand connections to the Internet. It prevents host lookups when the DeliveryMode option (DeliveryMode) is set to defer.