Steve Jenkins:
> So for example, let's say I wanted to limit outgoing mail to yahoo.com
> to 10 simultaneous connections and 20 emails per second. In master.cf
> I'm presuming I put:
> 
> yahoosmtp ? ? ?unix ?- ? ? ? - ? ? ? n ? ? ? - ? ? ? - ? ? ? smtp

To limit the concurrency to 10:

/etc/postfix/main.cf:
    yahoosmtp_destination_concurrency_limit = 10
    transport_maps = hash:/etc/postfix/transport

/etc/postfix/transport:
    yahoo.com   yahoosmtp:

Details:
http://www.postfix.org/postconf.5.html#transport_destination_concurrency_limit
http://www.postfix.org/postconf.5.html#transport_maps

To limit the sending rate:

/etc/postfix/main.cf:
    yahoosmtp_rate_delay = 1
    transport_maps = hash:/etc/postfix/transport

/etc/postfix/transport:
    yahoo.com   yahoosmtp:

The ..._destination_rate_delay feature always sends one message at
a time, and it does not support delays smaller than 1s. It is
primarily meant for home users and their ISP's usage policies.

Details:
http://www.postfix.org/postconf.5.html#transport_destination_rate_delay
http://www.postfix.org/postconf.5.html#transport_maps
http://www.postfix.org/postconf.5.html#transport_destination_recipient_limit

        Wietse

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