4.7 on page 273.
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642 | Chapter 17: Configure sendmail.cf with m4
17.8.50 FEATURE(relay_mail_from)
Relay based on MAIL From: and on RELAY in access_db V8.10 and later
By declaring this FEATURE(relay_mail_from), you enable relaying for envelope sender
addresses based on the RELAY value in the access database. This feature, how it is used,
and how it fits into relaying and spam handling are explained in ?§7.4.8 on page 274.
17.8.51 FEATURE(require_rdns)
Reject unresolvable IP addresses V8.14 and later
This FEATURE(require_rdns) rejects clients whose IP address cannot be properly resolved
with a reverse lookup. This feature is described in?§7.6.5 on page 296.
17.8.52 FEATURE(smrsh)
Use smrsh (sendmail restricted shell) V8.7 and later
Although sendmail tries to be very safe about how it runs programs from the aliases(5) and
~/.forward files (?§12.2.3 on page 468), it still can be vulnerable to some internal attacks. To
limit the selection of programs that sendmail is allowed to run, V8 sendmail includes source
and documentation for the smrsh (sendmail restricted shell) program. See ?§10.8 on page
379 for a full description of the smrsh program.
17.8.53 FEATURE(stickyhost)
Differ user from user@local.host V8.7 and later
Beginning withV8.
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