Re: Article in Security UPDATE newletter

Meng Weng Wong <mengwong(_at_)dumbo(_dot_)pobox(_dot_)com> writes:

> hence greylisting, and accreditation and reputation systems.
And greylisting can be a problem as well. There are some broken mail
systems (sending legitimate mail) which treat the greylister's
"temporary failure, please try later" as a delivery acceptance and
never resend. Nor do they (or the particular one I have encountered)
give a non-delivery report to the sender.