> On 4 Sep 2020, at 14:15, Michael Rathbun via mailop <[email protected]> wrote: > > On Fri, 4 Sep 2020 08:34:15 +0100, Laura Atkins via mailop <[email protected]> > wrote: > >> Microsoft doesnt just block new IP addresses for being new. > > Actually, there was a mechanism in place when I worked there that would refuse > traffic from an IP if > (a) no traffic had ever been received from it; and > (b) there had been signifcant spam traffic from other IPs in that /24 at some > time.
That’s not for just being new, though. That’s for being new in a known-bad range with a history of spam. > I handled four or five delist requests for that BL per week. Whether that is > still in place many years later, I can only speculate. The logic for > implementing such a mechanism is weak, but the cost of removing it might be > significant. laura -- Having an Email Crisis? We can help! 800 823-9674 Laura Atkins Word to the Wise [email protected] (650) 437-0741 Email Delivery Blog: https://wordtothewise.com/blog
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