max-ncache-ttl

[Len Conrad]

>If decreasing the time for the negative cache is not a good thing, any ideas
>of what I can do to help us resolve the domain names. We have mail that sits
>in the queues.

shorten your mail queue_retry time and increase queue_lifetime, since 
probably the mail will punch through eventually.

>  We have a current db.cache file. Could the problems be
>Internet Latency?

could be anything.

when you see these mails deferred, dig for its MX to see whether you get an 
answer.

what are the deferral reasons in the maillog?

Some MX's really suck. webtv is the worst I know, zwallet's next, while 
yahoo can have problems, but consistent deferrals MSN and Hotmail MX's show 
MS really doesn't know how to get their $billions to support infrastructure 
mail volumes.  AOL MX's typically  don't show any mail deferrals.

Len


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