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
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 . |