> > Is this a relatively new requirement from Outlook.com?
>
> New as of early 2025. Announced in April, went into enforcement in
> May. I put out a video on it here:
> https://www.youtube.com/watch?v=FIIYlR5Ymig
Thanks, that's just the info I was looking for.
Your video tells me that it's 5,000 messages per _day_ that triggers the
"bulk sender" requirements. Pity the Microsoft help page doesn't say that
(5,000 messages per day is 24 times fewer than 5,000 messages per hour!).
Odd that my customer has only hit this new requirement in the last week or
so. Perhaps they've just done some unusually large email campaigns. I'll
ask them.
> Yep, bulk senders need to have SPF, DKIM and DMARC in place. I
> wouldn't focus on whether it was actually 4,999 emails or 5,001 emails
> or over what timeframe. Those are the wrong things to argue. You're
> clearly serving up enough mail here to be considered a bulk-ish
> sender.
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.
I have added DKIM to their outgoing mail, and hopefully that will help.
Anthony
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