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Postfix: The Definitive Guide by Kyle D. Dent

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Name

smtp_pix_workaround_delay_time

Possible values:

time unit

Default:

10s

Certain older Cisco PIX firewalls contain a bug that causes them to interfere with SMTP delivery when the final period and CR/LF indicating the end of message content arrive in separate packets. Postfix can automatically detect the problem and adjust for it by waiting before sending the final period and CR/LF to give the socket send buffer a chance to empty out. The smtp_pix_workaround_delay_time parameter specifies how long Postfix waits for the socket send buffer to empty.

Example:

smtp_pix_workaround_delay_time = 10s

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