> 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.

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.

> I have added DKIM to their outgoing mail, and hopefully that will help.

Good deal.

Glad my video was able to help. :)

Cheers,
Al

-- 

Al Iverson // 312-725-0130 // Chicago
http://www.spamresource.com // Deliverability
http://www.aliverson.com // All about me
https://xnnd.com/calendar // Book my calendar
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