On Wed, Oct 22, 2008 at 3:47 PM, Matthias Haegele <[EMAIL PROTECTED]> wrote: > Diego Liziero schrieb: >> >> BTW, has anyone a regexp ready to accept all names that might be real >> smtp-out servers? >> >> (such as mail|smtp|mx|email and so on) >> >> I think it can be useful for example to whitelist them before greylisting. > > I think this is rather a bad idea. I would prefer to treat them on their > behaviour > (use helo checks, check for reverse dns ..., you should find several > examples in this thread, from mouss ...) .
I do already have them, and they works fine, and then I've greylist as last resort, but people are getting annoyed by the delay caused by greylisting, and I'm getting tired to whitelist by hand some rarely used smtp servers because of users complaints. That's why I'm looking for a "smtp server dns names" whitelist just before greylist. > What would prevent a spammer to name his box "smtp" e.g.? I know, and what prevents a spammer to run a queue, or to retry twice to bypass greylist? > You could use the botnet plugin for Spamassassin if used at your site. Ok, I'll have a look at it. Regards, Diego.
