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$=R

Hosts for whom to relay V8.9 and above

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 (Section 7.4.1.1) and RELAY_DOMAIN_FILE (Section 7.4.1.2).

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