> Greylisting seems to be the most effective way of eliminating unwanted > email. The problem is that it also has the potential to eliminate a > legitimate email. Couldn't a feature be added to greylisting software > that dispatches an email to the sender of any email that is > temporarily rejected and doesn't retry within a certain amount of > time? The email could say something like, "Your message of {date} was > rejected as possible spam. Please call us at {phone_number}." > > - GrantI'd just configure a retry time of something large if you're worried about it. IIRC the default is one day and you could raise it to two days on a slow system without worrying that the db is getting too large.
How exactly are legitimate messages lost through greylisting? I've come up with these: 1. legitimate messages that don't retry (someone mentioned Amazon newsletters) 2. legitimate messages that take longer than the maximum specified retry period to retry (has anyone run into a mail server that takes longer than a day to retry?) 3. legitimate messages that retry from a different server each time they retry (someone mentioned that they have seen this) - Grant -- [email protected] mailing list
