When sendmail first begins to run, class $=q is empty. A reasonable value in most countries
might be text/plain (although probably not in countries that use 16-bit characters, such as
China). Other values for this class might be text or text/html.
22.6.11 $={ResOk}
Mark a successful DNS lookup V8.12 and later
FEATURE(accept_unresolvable_domains) (?§17.8.2 on page 614) allows all mail to be
received, even when the domain part of the envelope-sender address cannot be looked up.
This feature is implemented in rules, in part, by using the $={ResOk} class macro to hold a
value that indicates that an unresolved, envelope-sender address is acceptable.
The $={ResOk} class macro is strictly intended for use by this feature and should not be
used for anything else, or be modified in any way.
22.6.12 $=R
Hosts for whom to relay V8.9 and later
The class $=R holds as its list of values the host and domain names that sendmail should
allow mail to be relayed to. This $=R class should not be used directly because it could
change without notice in future versions of sendmail. See RELAY_DOMAIN (?§7.4.1.1 on
page 269) and RELAY_DOMAIN_FILE (?§7.4.1.2 on page 269).
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22.6 Alphabetized Class Macros | 875
22.6.13 $={tls} and $={Tls}
Possible values for TLS policy in access map V8.
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