Re: Sendmail & Queuing
Jason,
On Tue, Dec 02, 2003 at 10:19:07AM -0500, Jason McMullen wrote:
>
> I'm running into an odd issue. We have 2 servers that act as
> "front-end" MX hosts running Sendmail. These servers then smarthost all
> mail back to a main server. This works well at keeping the main server
> unloaded due to dictionary attacks and whatnot. The problem we're
> seeing is the MX hosts bogging down when trying to deliver mail to the
> main host.
>
> Does anyone have any tried and true methods for getting Sendmail to be a
> little "nicer" about its queuing strategy? Or is the best option qmail
> or another MTA?
Make sure that SingleThreadDelivery is turned off on the MX. On the
smarthost however make sure it's not dropping connections too early.
Look at the the REFUSE_LA and QUEUE_LA (sendmail must have the correct
LA_TYPE compiled in). Also look at the CONNECTION_RATE_THROTTLE and
MAX_DAEMON_CHILDREN parameters.
It may also help to pay attention to which host is resolving what.
Hope this helps.
--
Henk Roose - Henk.Roose@cwi.nl
CWI - Centrum voor Wiskunde en Informatica
Centre for Mathematics and Computer Science
Amsterdam (NL)
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