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Postfix: The Definitive Guide by Kyle D. Dent

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Name

smtp_data_xfer_timeout

Possible values:

time unit

Default:

180s

Limit on the amount of time the SMTP client waits while sending the message contents. If the connection stalls for more than the specified value, the SMTP client terminates the connection.

Example:

smtp_data_xfer_timeout = 180s

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