[Greylist-users] Possible Enhancements

[Jason 'XenoPhage' Frisvold]

I was reading some postings on Nanog regarding mail and saw what 
appeared from the start to be a semi-decent idea...

What if the greylisting process checked for an MX record, and did a 
simple callback to see if the server was live?  If the answer is yes to 
both, then allow the mail through.  If not, go through the normal 
blocking procedure, flagging the entry as already tested..  ?  That 
would cut down on delaying legitimate mail, while still blocking mail 
from zombies.  (Even if a zombie responded to the callback, it's nearly 
impossible for the zombie to have a valid mx record...)

Thoughts?

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Jason 'XenoPhage' Frisvold
Engine / Technology Programmer
friz at godshell.com
RedHat Certified - RHCE # 803004140609871
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"Something mysterious is formed, born in the silent void. Waiting alone and unmoving, it is at once still and yet in constant motion. It is the source of all programs. I do not know its name, so I will call it the Tao of Programming."