Luckforest hit 0 of 12 Outlook inboxes with auth passing
A placement test found Gmail fine and Outlook junking everything, on a list that was 44% Outlook.
Luckforest says he sent 400 cold emails and got zero replies, with 12 inboxes at 100% warmup health and SPF, DKIM and DMARC all passing. A placement test in Instantly then split the picture by provider. Gmail put 23 of 24 in the inbox. Outlook put 0 of 12 in the inbox, all spam.
The number that makes it expensive is the list composition. He says 44% of his list was on Outlook, so close to half the campaign went to junk while every health signal he had access to said the setup was clean.
What he changed
He did not rebuild infrastructure. He edited the email. Links came out, the feature list came out, the price mention came out, and what was left was shorter, plain text, with one question. The retest on Outlook came back 18 of 18 in the inbox.
That is one sender, one list and one round of edits, with no control for anything else that may have shifted between tests, so treat the 18 of 18 as his result rather than a rule. The useful part is the sequence, not the copy prescription. He tested placement per provider first, then changed the message, instead of guessing at the message and never finding out whether it moved.
For people sending
Warmup score and authentication are necessary and they are not evidence. They describe whether your domain is configured correctly and whether seed mail is being opened somewhere, not whether a specific provider's filter is accepting your specific message. A setup can be fully authenticated and still be filtered by one mailbox provider while the other waves it through, which is exactly the shape Luckforest reports.
It also explains a failure mode that looks like a copy problem or a list problem. Zero replies on 400 sends reads as bad targeting until you learn that almost half the recipients never saw the email. If your ICP skews Microsoft, which plenty of B2B lists do, a Gmail-only sanity check will tell you everything is fine while the half of the list that matters is sitting in junk.
The cheap move is to segment your placement reporting by provider before you touch anything else, and to know the Outlook share of any list you are about to send to. Infrastructure dashboards do not surface that split for you.
warmup scores and authentication tell you nothing about where your email lands
Know what is landing before you burn another domain
One email a day. Under three minutes. What the operators found out yesterday.