outgoing rate control - ReadList.com

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outgoing rate control
\ Juan Pablo Bagnon (21 Jul 2007)
. \ Alain Spineux (22 Jul 2007)
. \ Juan Pablo Bagnon (22 Jul 2007)

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Subject:	outgoing rate control
Group:	Postfix-users
From:	Juan Pablo Bagnon
Date:	21 Jul 2007

Dear list members:

i was in the need to catch all the overwelming tsunami of emails that my
content filter server (CFS) is getting with a postfix server, then, sending
with a controlled rate, tunning it untill the CFS works w/o colapsing.

i did some sort of a solution that works but i dont have a fine control of
the message rate feeding my lame CFS. the only thing i have in mind is set a
IP traffic sharping.
QoS can control the ammount of data passed to the CFS but is not efficient
in the number of emails, mostly spam (~80%). these spam messages are mostly
less than 1 kb so the real problem of my CFS is processing emails/minute
than KB/minute.

i have googled and found and implemented the solution above. im not happy
with it... is there another tecnically more robust and better than this?

from <http://www.akadia.com/services/postfix_mx_backup.html>
http://www.akadia.com/services/postfix_mx_backup.html i did:

/etc/postfix/main.cf:

relay_domains = $mydestination the.backed-up.domain.name
smtpd_recipient_restrictions = permit_mynetworks
check_relay_domains

/etc/postfix/main.cf:

transport_maps = hash:/etc/postfix/transport

/etc/postfix/transport:

the.backed-up.domain.name smtp:[their.mail.host.name]

then from
http://groups.google.com.ar/group/list.postfix.users/browse_thread/thread/cf
0fe8258b1fedd/a07e91e50c693fe4?lnk=gst
<http://groups.google.com.ar/group/list.postfix.users/browse_thread/thread/c
f0fe8258b1fedd/a07e91e50c693fe4?lnk=gst&q=rate+limiting&rnum=37&hl=e s#a07e91
e50c693fe4> &q=rate+limiting&rnum=37&hl=es#a07e91e50c693fe4

i have set to 1 all of this values:

*_destination_recipient_limit
*_destination_concurrency_limit

from somewhere else i got a solution to hold for 5 secs every delivery
setting a fake non functional transport and playing with
smtp_connect_timeout, so the final setup is this:

master.cf:

brc unix - - n - 1 smtp
-o fallback_relay=[dest.ip.1.ok]
-o smtp_connect_timeout=5
brc2 unix - - n - 1 smtp
-o fallback_relay=[dest.ip.2.ok]
-o smtp_connect_timeout=5

main.cf

initial_destination_concurrency = 1
default_destination_concurrency_limit = 1

transport_maps =
hash:/etc/postfix/transport
relay_domains =
hash:/etc/postfix/relay_domains

brc2_destination_concurrency_limit = 1
brc2_destination_recipient_limit = 1

brc_destination_concurrency_limit = 1
brc_destination_recipient_limit = 1

transport

domain1.ltd smtp:[real.ip.addr.ok]
domain2.ltd brc:[10.10.10.10]
domain3.ltd brc2:[10.10.10.10]

take in mind that i need to archive is the opposite of the developers have
working on all this time: performance.
i need to hold the emails with this server and slowly feed in a
message/minute based rate with the finest control posible to set a proper
rate for letting the CSF opperate efficiently.

thanks in advance.