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Re: Sendmail 'Too many connections' problem



On Tue, 2006-09-12 at 15:34 +0100, Paul Howarth wrote:
> > I run sendmail-8.13.8 at home to host my domain. Some domains will not 
> > accept mail from me because my address is from a dynamic address pool so 
> > I solved that problem by placing all of those domains in my mailertable 
> > and now route those messages through my ISP(RCN). Recently I have 
> > noticed that some of the mail is hanging for a while with 400 series 
> > messages saying 'Too many connections'.

How fast do the people in this home type???

>  I checked with RCN and after 
> > many wasted hours on hold I found out that I need to limit the maximum 
> > number of connections to their SMTP server to 4. Four shall be the 
> > counting. Five is too many and six is right out!
> > 
> > Can someone please tell me what the incantation is to limit the number of
> > simultaneous connections to a particular server? I'm not looking to 
> > limit incoming conncetions. I'm not looking to limit the rate of 
> > incoming or outgoing connections. I just want to set the max nr of 
> > connections from me to RCN to no more than four.
> 
> Looking at the holy README file of Antioch in the sendmail-cf package, 
> it appears that setting confHOST_STATUS_DIRECTORY and 
> confSINGLE_THREAD_DELIVERY will have the result of limiting outbound 
> connections to any one host to 1. Whilst this is not 4, it's likely to 
> at least get your mail delivered eventually.

Setting delivery mode to queued and doing frequent queue runs might
be the best option.  Sendmail normally will only open one connection
to a particular destination on queue runs so both ends save time
reusing the cached connection.  And you can control the number of
possible outbound connections delivering queued messages with
confMAX_QUEUE_CHILDREN and confMAX_RUNNERS_PER_QUEUE.

-- 
  Les Mikesell
   lesmikesell gmail com




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