>what is the best way to tell if a site is down?

maillog file

>And what do you guys usually do when one of the sites go down?

if it's down long enough to notice, then I remove the RBL, as I did with 
osirus.

>  do you just
>leave everything alone or remove the entry from the main.cf file and then
>add it later when it's back up?

yes

>when osirusoft was down, I was getting lots of messages in the logs and it
>was slowing down mail transfer, so I removed it.

that's the situation.  incoming mail is slowed down quite bit, and memory 
and file usage is increased.

Len


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