[CentOS] question on sending mail with 5.2

[Ralph Angenendt]

Luke S Crawford wrote:
> considering just how many people use greylisting, this is likely a 
> bad idea.    Greylisting works by rejecting the first message from a new
> server with a 4xx (temporary) error code.   If the server tries again
> immediately or never tries again, it's probably a spammer.  If the server
> waits a reasonable period of time (say, 30 minutes) and then re-sends the
> mail,  it's probably legit, and the greylist program puts that server on the 
> whitelist so mail from that server goes through right away next time.
> 
> Many people set things up such that if you try again immediately, you get
> put on a blacklist, as you are probably a spammer.  

I really don't understand why people just don't turn off their mailservers if they 
don't want mail from others.

Ralph
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