Deliverbymin Channel Option

Limiting time to deliver )
The  channel option controls the availability and the minimum by-time allowed by the DELIVERBY SMTP extension specified in RFC 2852. A value of -1, the default, disables the extension. A value of 0 enables the extension with no minimum by-time. Any other value is treated as the minimum by-time.

See also:
 * deliverbychannel Option
 * log_deliver_by MTA Option
 * SMTP and LMTP protocol channel options