Better deliverability for Outlook & Microsoft 365
Outlook and Microsoft 365 run some of the strictest spam filters around. Build the reputation and authentication that keep your mail out of Junk.
Microsoft's filtering (including SmartScreen and SCL scoring) is notoriously aggressive with new or cold senders. Strong authentication and a steady, trustworthy sending pattern are the most reliable ways to reach Outlook and Microsoft 365 inboxes.
Live reputation scoring
A 0–100 score built from real signals — authentication, bounces, complaints, placement and engagement — so you always know where you stand.
Inbox placement tracking
See whether your test mail lands in Primary, Promotions or Spam, plus SPF/DKIM/DMARC results, before you run a real campaign.
Gradual, human-like warmup
Volume ramps day by day from a safe baseline so mailbox providers see steady, organic growth instead of a spammy spike.
Why Outlook sends good mail to Junk
Microsoft weighs sender reputation, authentication alignment and recipient engagement heavily. A new domain with no history, or a sudden volume increase, often gets quarantined or junked by default.
Getting your SPF, DKIM and DMARC aligned is step one — use our free checkers to confirm them. Building a consistent, positive sending history is step two, which is where warmup helps.
How to improve Microsoft deliverability
Verify authentication with our SPF, DKIM and DMARC checkers, keep lists clean with the email checker, and warm up your sending so reputation grows steadily rather than spiking.
Note: Trustmailtoday's automated warmup currently connects mailboxes via Google OAuth. The authentication tools and deliverability guidance on this page apply to any domain, including Microsoft 365.
Frequently asked questions
Does Trustmailtoday connect directly to Outlook?
Our automated warmup connects via Google OAuth today. Our free authentication and deliverability tools work for any domain, including Microsoft 365 and Outlook, and our guidance applies regardless of provider.
Ready to land in the inbox
Connect your inbox and start building real sender reputation today — free to start.
Secured by OAuth 2.0 · Disconnect anytime