Send personalized mail merge campaigns, track opens & clicks, and automate follow-ups — all from your Outlook inbox.
OutMass is a Chrome and Edge extension that adds mail merge and mass email to Outlook on the web. It works with Microsoft 365 and Outlook.com accounts, and sends every message through your own mailbox using the Microsoft Graph API. The free plan covers 250 emails a month; Starter is $9 a month for 2,500 emails and Pro is $19 a month for 10,000.
Add to Chrome — It's Free See PricingAlso available for Microsoft Edge
Import contacts from CSV and send personalized emails at scale using merge tags like {{FirstName}} and {{Company}}.
Know exactly who opened your email and clicked your links with real-time tracking and detailed reports.
Automatically follow up with recipients who haven't replied, or who haven't opened your email — anyone whose reply has been detected is left out (your inbox is checked every six hours). Scheduled and sent server-side. (Pro plan)
No new app to learn. OutMass lives inside Outlook Web as a Chrome extension — right where you work.
Emails are sent via Microsoft Graph API through your own account. Better deliverability, no third-party servers.
Start with 250 free emails per month. Upgrade when you need more — paid plans start at $9/month.
Start free. Upgrade when you're ready.
The free plan sends 250 emails a month. Paid plans start at $9.
Add to Chrome — It's Free