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Postfix Documentation
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Configuration parameters

Parameters that control proxying:

  • smtpd_proxy_filter (syntax: host:port): The host and TCP port of the before-queue content filter. When no host or host: is specified here, localhost is assumed.

  • smtpd_proxy_timeout (default: 100s): Timeout for connecting to the before-queue content filter and for sending and receiving commands and data. All proxy errors are logged to the maillog file. For privacy reasons, all the remote SMTP client sees is "451 Error: queue file write error". It would not be right to disclose internal details to strangers.

  • smtpd_proxy_ehlo (default: $ myhostname): The hostname to use when sending an EHLO command to the before-queue content filter.

Postfix Documentation
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