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Postfix Documentation
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Configuring the Postfix fast ETRN service

The behavior of the flush(8) daemon is controlled by parameters in the configuration file.

By default, Postfix "fast ETRN" service is available only for destinations that Postfix is willing to relay mail to:

fast_flush_domains = $
smtpd_etrn_restrictions = 
permit_mynetworks, reject


  • The relay_domains parameter specifies what destinations Postfix will relay to. For destinations that are not eligible for the "fast ETRN" service, Postfix replies with an error message.

  • The smtpd_etrn_restrictions parameter limits what clients may execute the ETRN command. By default, any client has permission.

To enable "fast ETRN" for some other destination, specify:

fast_flush_domains = $
relay_domains, some.other.domain

To disable "fast ETRN", so that Postfix rejects all ETRN requests and so that it maintains no per-destination logfiles, specify:

fast_flush_domains =
Postfix Documentation
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