FEATURE Declarations

In addition to minimal support, many handy features can be included with a line like:

FEATURE(feature)

Here, feature is selected from those listed below. Some accept additional arguments. See cf/README, and §19.3.4, for details.

• allmasquerade
• Causes the MASQUERADE_AS host to replace all header-recipient addresses too (see §19.6.6).
• always_add_domain
• Tells sendmail to always append the local domain to addresses that lack a domain part, even if the recipient is local (see §19.6.7).
• bestmx_is_local
• Accepts a hostname as local if the best MX record for that host is found in the class $=w (see §19.6.8).
• bitdomain
• Includes rules that support an external database for converting BITNET addresses into Internet addresses (see §19.6.9).
• domaintable
• Allows use of multiple domain names during a transition period (see §19.6.10).
• genericstable
• Includes rules that support use of a User Database-like facility to change sender addresses so that senders can be delivered to new hosts (see §19.6.11).
• limited_masquerade
• Specifies that only hosts declared with MASQUERADE_DOMAIN and MASQUERADE_DOMAIN_FILE may be masqueraded (see §19.6.12).
• local_procmail
• Includes rules that allow procmail(1) to be used as the local delivery agent (see §19.6.13).
• mailertable
• Includes rules that support a database that maps host.domain names to special delivery agents and new domain name pairs. Essentially it provides a database hook into rule set 0. The new domain names are used for routing but are not reflected in the headers of messages (see §19.6.14).
• masquerade_entire_domain
• Causes all hosts under any domains declared by MASQUERADE_DOMAIN or MASQUERADE_ DOMAIN_FILE to be masqueraded. Ordinarily, masquerading only transforms hosts from a list of hosts in the class $=w (see §19.6.15).
• masquerade_envelope
• Causes the envelope to be masqueraded too. Ordinarily, masquerading only affects the headers (see §19.6.16).
• nocanonify
• Prevents sendmail from passing addresses to $[ and $] for canonicalization. Ordinarily, as part of rule set 3, sendmail tries to canonify (add a domain to) any hostname that lacks a domain part (see §19.6.17).
• nodns
• Once caused DNS support to be excluded from the configuration file, but now does nothing. Deprecated; use the ServiceSwitchFile instead (see §19.6.18).
• nouucp
• Excludes UUCP support from the configuration file (see §19.6.19).
• nullclient
• Produces a minimal configuration file that can only forward mail to a mail hub machine (see §19.6.20).
• redirect
• Adds support for address.REDIRECT forms of addresses. This is chiefly used to bounce retired-account mail with useful forwarding information (see §19.6.21).
• smrsh
• Cause smrsh(1) (sendmail restricted shell) to be used in place of /bin/sh as the shell for the prog delivery agent (see §19.6.22).
• stickyhost
• Causes all addresses without a host part to be forwarded to a central mail server, while allowing those with a local host part to remain on the local machine and be delivered in the usual local way (see §19.6.24).
• use_ct_file
• Causes a list of trusted users to be read from the /etc/sendmail.ct file (see §19.6.25).
• use_cw_file
• Causes a list of local hostnames to be read from the /etc/sendmail.cw file (see §19.6.26).
• uucpdomain
• Includes rules that cause hostnames of the form host.UUCP to be looked up in a database. If found, they are rewritten to an @host form as specified in that database (see §19.6.27).
• virtusertable
• Maps virtual (possibly nonexistent) domains into new addresses. Note that this reroutes delivery, but does not change the mail headers (see §19.6.28).