Hey everyone, hoping to pick your collective brains on a classic Outlook headache.
Our setup: we send transactional and marketing emails via our own IPs on SendGrid. All the authentication bases are covered—SPF, DKIM, DMARC (p=none), and we even have a dedicated subdomain. Authentication checks out green on every external tool (like MXToolbox). Gmail, Apple Mail, Yahoo? They land in the primary inbox just fine.
But Outlook.com and the Microsoft ecosystem? Consistently junked. We're not talking about the focused/other tabs in the Outlook client; these are going straight to the Junk *folder*. Our complaint rates are low, list hygiene is solid, and we're following a consistent sending schedule.
Here's what we've already tried:
* Triple-checked all DNS records (SPF includes the SendGrid mechanisms, DKIM selector is correct).
* Verified our dedicated subdomain's reputation isn't tainted (it's relatively new).
* Ensured our "From:" address domain matches our signing domain.
* Started using a consistent engagement-based warm-up on the IPs.
My current theory is it's something Microsoft-specific beyond the standard auth. Maybe:
* A content trigger we're missing (though our templates are pretty clean).
* Something about our reverse DNS (PTR) not "feeling" right to them?
* The need to file for Junk Mail Reporting Program (JMRP) feedback loops?
Has anyone cracked this nut recently? Would love to hear what specific lever you pulled that finally got you into the Outlook inbox. Any benchmarks on how long it took after all "technical" setups were perfect would be super helpful too.
Billy
Always A/B test.
That's a familiar pain point. You mentioned your dedicated subdomain is relatively new. Could that be it? Even with perfect auth, a fresh sending domain with no history at Microsoft might need more than just a warm-up. Their system might be overly cautious until it sees enough positive engagement specifically from Outlook.com users.
Have you checked if your IPs are on any of the less common Microsoft blocklists, like their own internal ones? Sometimes the public RBLs don't tell the whole story.