> > That's what I'm surprised about, I don't consider my customer to be a
bulk
> > sender.
> >
> > Now I know that Microsoft consider 5,000 messages per _day_ a "bulk
sender"
> > I know the scale of the issue.
>
> Yeah, but my point is that the 5k/day is not even necessarily
> descriptive enough. What day? US Pacific Time, where Microsoft HQ is?
> Midnight to Midnight? UTC?
> Is it a rolling 24 hour window? Do deliveries count (only), or do all
> attempts count, too? Successful DATA command only? There are a million
> nits to pick, if you look close enough.
Oh, yes, I know. My interest in how long a period the "5,000 messages" was
counted in was only to get an idea of _scale_. I'm not interested in the
_exact_ number of emails possible to not-trigger Microsoft's additional
requirements.
5,000 messages per hour is a completely different scale to 5,000 messages
per day, for example.
> So, I think it's best to just assume that if they're sending more than
> a handful of emails at a time, they're bulk senders, as far as this
> goes.
From the information gathered so far, sending a few hundred emails per day
is probably not classified as "bulk sending" for the purposes of
Microsoft's authentication requirements. But sending 10,000 messages in a
day would be.
Anyway, adding DKIM has fixed the problem for now.
Anthony
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