[Mailman-developers] Re: [meta-sig] mailman problems

[John Viega]

 > "John Viega" <jtv2j@cs.virginia.edu> wrote: 
> > 1) DNS lookup can be slow.  People want instant feedback.
> 
> People also want correct operation.  Seriously, how long can a DNS lookup
> take?  We're talking about subscribing to a mailing list.  This is not an
> operation one does dozens of times a day.  If it takes an extra 15 seconds,
> who cares?

I've seen it take several minutes when a DNS server is quite loaded.
I frequently see lookups that take 10-20 seconds. The vast majority of
users are typing in the correct thing anyway, and don't want to have
to wait around.  I'd prefer to catch the most common stuff, and give a
speedy response saying, "If you don't get mail from us soon, try
again, because we couldn't send mail to your address".