sendmail, 4th Edition

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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 FEATURE(relay_mail_from) on page 274.

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