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Gerry Maddock gmaddock at
Mon Jun 29 16:47:59 IST 2009

> >>> Alex Broens wrote:
> >>>> "works for me" != advisable  != 100% safe != under your controll !=
> > BCP
> >>> Technically there is no problem with the method.
> >>>
> >>> The issue is a moral one - people using this should realise that the
> >>> owner of tarbaby could very easily start collecting or rejecting mail
> >>> received for your domain either maliciously or by accident and as
> > people
> >>> using this service have no contract with the provider therefore have
> >>> comeback should this happen.
> >>>
> >>> Whilst the same could be said of any blacklists (they could reject
> >>> your mail either maliciously, on purpose or by accident), but
> >>> one of your MX records to a 3rd party goes a step further than this
> >>> could allow someone to collect your mail without your knowledge.  For
> >>> example: instead of sending 451 at DATA, they could easily do it
> >>> the message has been sent (at dot) and you'd be none the wiser.  It
> >>> would still function the same as it does now except a copy of the
> >>> message could be kept.
> >>>
> >>> At the end of the day - it's all about trust.
> >> + not all senders treat a 450 as such.
> >>
> >> There an $unknown_count of weird apps out there which don't requeue
> >> will silently drop a msg after a temp fail.
> >
> > Greylisting gives the same 450 error. Are you saying greylisting should
> > be used as best practice as well (instead use smtpd hard & soft error &
> > sleep times)? Just wondering.
> >
> I don't use greylisting - never will - wouldn't recommend it
> lots of people swear by it, its obviously up to you to balance and

Understood. Are you using any smtp hard/soft/error sleep times at all?

Steve, are you greylisting?

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