Sendmail SMTP server outgoing email rate

Ruben de Groot mail25 at
Fri Oct 30 12:05:31 UTC 2009

On Thu, Oct 29, 2009 at 09:50:06PM -0700, Aflatoon Aflatooni typed:
> 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 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? 

For incoming connections you are looking at the ratecontrol and conncontrol
features, see /usr/share/sendmail/cf/README.

For outgoing, I don't know. Why would you want to be so nice to the server ;)
They should rate-limit their server if they have a problem (and I bet they do this).

There is a SINGLE_THREAD_DELIVERY option, but that's probably not what you want.


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