OutMass review
OutMass pairs Outlook mail merge with campaign tracking and follow-up tools.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
OutMass is a Chrome and Edge extension for sending personalized mail-merge campaigns from Outlook Web. It is aimed at founders, sales development representatives, agencies, and teams that use Microsoft 365 or Outlook.com for outbound email. Campaigns can use CSV contact imports, templates, and personalized messages sent through the user's mailbox via Microsoft Graph API. Open, click, and reply detection, along with campaign reports, make it a fit for senders who want campaign-level engagement signals rather than a general-purpose inbox tracker.
The monthly plans scale by email volume and campaign tools. Free costs $0 per month and allows 250 emails, CSV recipient upload, mail merge, open and click tracking, and campaign reports. Starter costs $9 per month and raises the allowance to 2,500 emails; it adds scheduled sending, a daily send limit, CSV export, templates, and A/B testing. Pro costs $19 per month for 10,000 emails and adds automated follow-ups for people who have not replied or opened, A/B subject testing, 50 AI Email Writer drafts per month, and priority support. The tiers suit senders who can work within set monthly volumes; those needing broader general inbox tracking should look elsewhere.
Its strongest fit is the Outlook and Microsoft 365 workflow: messages are sent from the user's mailbox, and OneDrive attachments can be shared via links. Browser-extension delivery keeps the product tied to Outlook Web rather than a broad email-client ecosystem. CRM integrations are not part of its listed integration set, so teams that need tracking tied to a CRM may prefer another tool. Choose OutMass when tracked mail merge, reporting, and follow-ups within Outlook are the priority; skip it if your work centers on other inboxes or CRM-connected activity.
OutMass pros and cons
- Where it wins
- Tracks opens, clicks, and replies with campaign reports.
- Personalizes mail-merge campaigns from CSV contacts.
- Pro adds automated follow-ups and A/B subject testing.
- Where it doesn't
- Built around Outlook Web, not general inbox tracking.
- Free plan is limited to 250 emails per month.
- No CRM integrations are listed among its integrations.
OutMass fact sheet, pricing and score →
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