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From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: Aflatoon Aflatooni <aaflatooni@yahoo.com>
References: <148565.58717.qm@web56207.mail.re3.yahoo.com>
Date: Fri, 30 Oct 2009 15:04:13 +0200
In-Reply-To: <148565.58717.qm@web56207.mail.re3.yahoo.com> (Aflatoon
	Aflatooni's message of "Thu, 29 Oct 2009 21:50:06 -0700 (PDT)")
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Cc: freebsd-questions@freebsd.org
Subject: Re: Sendmail SMTP server outgoing email rate
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On Thu, 29 Oct 2009 21:50:06 -0700 (PDT), Aflatoon Aflatooni <aaflatooni@yahoo.com> wrote:
> Hi,
> Is there a way that I could configure sendmail so that I could control
> the rate of outgoing emails?
>
> For example if there are 2 outbound emails destined for Yahoo.com
> server then they would be sent one connection at a time so that it is
> not flooding their server.
>
> Also, is there a limit on the incoming connection for sendmail?

Yes, there is a limit for the incoming connections.  See the description
of "confCONNECTION_RATE_THROTTLE" and "confCONNECTION_RATE_WINDOW_SIZE"
in "/usr/share/sendmail/cf/README".

For outgoing connections Sendmail only supports throttling based on the
load average of the system, at least AFAIK.  So you will probably have to
use some sort of connection rate-limiting in your firewall if you want to
limit the number of outgoing connections.