Web Reference: Nov 29, 2012 · smtp_fallback_relay does not handle deferred messages; it will be tried immediately when the primary destination is unavailable. This is normally what you want - as the setting indicates, it is a fallback for relaying mail. Available with Postfix 2.2 and earlier: fallback_relay (empty) Optional list of relay hosts for SMTP destinations that can't be found or that are unreachable. Deploying and configuring a Postfix SMTP server. You can configure your email infrastructure by using the Postfix mail transport agent (MTA) to transport email messages between hosts by using the SMTP protocol. Postfix is a server-side application for routing and delivering mail.
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Devops Sysadmins Postfix Smtp Fallback Net Worth 2026: Salary, Income & Wealth Net Worth & Biography

Estimated Worth: $79M - $102M
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Last Updated: April 11, 2026
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