To add to what Laura said, when we first started getting lots of questions
about why specific campaigns got bulked at Gmail, we found lots of the
campaigns having blacklisted links in them. We could never tell if it was
because Gmail actually used those blacklists, or just independently arrived
at similar evaluations, but in either case we started blocking campaigns
from being sent if they had blacklisted domains in them. Helped a lot.

Tim Starr
Sr. Director, Deliverability, Maropost

On Wed, Aug 2, 2017 at 10:36 AM, Laura Atkins <>

> On Aug 2, 2017, at 3:15 AM, Benjamin BILLON via mailop <>
> wrote:
> In the case of Gmail, you can have _some_ hint about your domain's
> reputation with the Gmail Postmaster Tools
> @Laura> nice article, would it also apply to Hotmail, from your opinion?
> Hotmail has some different tools in the box for filtering. IMO, Microsoft
> relies more on IP reputation than Google does. Some of that is historic.
> Google came onto the email scene later that everyone else (mid-2000s was
> beta, I think). They also had money, lots of hardware, and internal
> expertise to do content filtering. Google never really did IP based
> filtering. Sure, there were some times when they’d push some mail away from
> the MTAs, but most of their filtering was done after the SMTP transaction.
> The short version of this is I never really pay any attention to IP
> reputation when dealing with Gmail. It’s just another factor. Unless you’re
> blocked and if you get blocked by Gmail, wow, you really screwed up.
> Hotmail, in contrast, was founded in the early 90s and their filtering
> started with IPs and then grew to deal with new threats. Hotmail still has
> IP filtering at the base of the filtering pyramid. They also have the tools
> and processes that enable them to block ranges rather than just IP
> addresses. So I pay a little more attention to IP reputation at Hotmail.
> The caveat with all of this is that I don’t really care or check public
> reputation scores. I know of senders with a SenderScore of 99 who can’t get
> to the inbox to save their life, and senders with a SenderScore of 7 that
> don’t have deliverability problems. Knowing what I do about SenderScore,
> the data makes sense but I can get enough of a sense of the reputation
> without having to visit the RP website. I will check Talos/Senderbase. The
> ratings are less granular than SenderScore - basically bad, fine and great
> - but I actually find that more useful. I can also look at surrounding IPs
> and see what’s going on there.
> What the ISP is telling me is way more important. Microsoft delaying /
> refusing mail during the SMTP transaction? All of the public reputation
> scores are irrelevant, it’s what MS thinks that’s relevant. Just because
> the public scores are fine, doesn’t mean that everything’s fine. The more
> specific feedback overrides the general / public feedback.
> laura (I think I just wrote today’s blog post)
> --
> Having an Email Crisis?  800 823-9674 <(800)%20823-9674>
> Laura Atkins
> Word to the Wise
> (650) 437-0741
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