Milter-greylist

>Just a comment on the 400 sendmail children running . . .
>
>We were seeing increasing numbers of sendmail children, until the limit
>was hit and mail could not be accepted. The log files showed repeated
>entries where it stopped accepting connections and then resumed. But the
>system load shown by uptime was low, and top didn't show sendmail,
>mimedefang or any related stuff eating the cpu. Finally, netstat showed
>that the sendmails had established connections and weren't doing
>anything. It seems the bots are not closing the connection now when they
>are rejected. The default in sendmail.cf is to wait an hour before
>closing the connection, which seems archaic in this day and age. So, we
>started diddling parameters in sendmail. Took the number of children way
>down and greatly increased performance quality for our users. I believe
>the most pertinent parameter for that particular issue was
>Timeout.command. We took our number of children from 200 down to 20-50
>almost instantly, by changing that from 1hr to 5m. Your volume is higher
>than ours, so numbers will vary.

Thanks Chris, I'll have a look at the timeout options. 

Rgds Jonas


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