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Postfix Documentation
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What destinations to relay mail to

By default, Postfix will forward mail from strangers (clients outside authorized networks) to authorized remote destinations only. Authorized remote destinations are defined with the relay_domains configuration parameter. The default is to authorize all domains (and subdomains) of the domains listed with the mydestination parameter.

Examples (specify only one of the following):

relay_domains = $
mydestination (default)
relay_domains =           (safe: never forward mail from strangers)
relay_domains = $
mydomain (forward mail to my domain and subdomains)
Postfix Documentation
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