[Greylist-users] Adelphia vs greylisting

[Dave Warren]

Barb Dijker wrote:

> We had a problem with a cable company that would not retry soon after  
> the block (5 minutes), but would retry once at 24 hours and then  
> never again.  I don't recall what company it was.  So we tried  
> opening up our retry time to 25 hours.  It didn't appreciably  
> increase spam, so that's where we left it.  I hate one-off whitelisting.
>
> The spec doesn't say how soon one must retry.  In some logic, for  
> some sites, waiting a day may make sense.

Personally, I'm currently greylisting for 5 minutes, then whitelisting for 28 days from the last time the triplet was attempted (whether or not it was successful)

I haven't seen much spam slipping in during the 24-hour and 28 day window that didn't also try a redeliverying between 5-minutes and 24-hours.

If the zombie world changes I'll update my configuration appropriately, but this seems to reduce the negative impacting of greylisting rather significantly.

I do tend to play with my greylisting period a lot, anywhere from 5 minutes to 60 seems to be around the same effectiveness, so I keep it short to avoid annoying users.

-- 
I guess we'll be going down together, I mean getting off together, 
I mean ... That's Ok, I'll just press the button for the stimulator.
Elevator!
 -- Homer Simpson