Microsoft weights sender reputation via SNDS and JMRP, and rejects unauthenticated bulk mail to consumer Outlook.com addresses.
What Google Postmaster Tools are#
Google Postmaster Tools is a free dashboard showing how Gmail sees your domain: spam rate, domain and IP reputation, authentication pass rates, encryption, and delivery errors, for senders with meaningful volume.
Why it matters#
It is the only direct view into Gmail's opinion of your mail, and Gmail is usually the largest share of any consumer list.
Setting up Google Postmaster Tools for Outlook and Microsoft 365#
- Add your sending domain and verify with a TXT record.
- Send consistently for a few days so data appears.
- Check spam rate daily; stay under 0.1% and never above 0.3%.
- Investigate any day domain reputation drops from High.
- Correlate authentication failures with new sending sources.
How Outlook and Microsoft 365 reports results#
Open a delivered test message in Outlook and Microsoft 365 and view the original or headers. Look for Authentication-Results and any provider-specific verdict headers. Use the provider's sender dashboard for aggregate reputation.
Common mistakes#
- Verifying the root domain but sending from an unverified subdomain.
- Reading reputation as a single day rather than a trend.
Frequently asked questions#
Why is Postmaster Tools empty?
Volume is too low for Gmail to report, the domain is not verified, or you are looking at the wrong domain (From versus DKIM d=).
Does Outlook and Microsoft 365 require Google Postmaster Tools?
Microsoft weights sender reputation via SNDS and JMRP, and rejects unauthenticated bulk mail to consumer Outlook.com addresses. Treat Google Postmaster Tools as required for any meaningful volume.