OutreachMerge — Mail Merge for Outlook & Microsoft 365 is a strong option, but it is not the right fit for everyone. Below are 10 alternatives compared on rating, install base, pricing and the use case each one actually wins on.
Mail merge has lived in Gmail forever. Outlook and Microsoft 365 finally get a real one. OutreachMerge runs personalized mail-merge campaigns straight from your own Microsoft 365 or Outlook mailbox. Import a CSV of recipients, write your subject and body with {{ merge_fields }}, preview against a real row, and send — rate-limited and safe. — HOW IT WORKS — 1. Connect Microsoft — sign in to your own account with secure OAuth 2.0 + PKCE. No passwords stored, no client secret, no third-party mail server in the middle. 2. Import your CSV — drop in a list of recipients and OutreachMerge auto-detects the email column. 3. Personalize & send — write with {{ first_name }}, {{ company }}, or any column, preview the result, and send from your mailbox. — WHY OUTREACHMERGE — • Send from YOUR mailbox via the official Microsoft Graph API. The From address is always your signed-in account — never spoofed, never relayed. • Merge fields + live preview against a real recipient before anything sends.
| Extension | Rating | Users | Pricing | Best for |
|---|---|---|---|---|
| OutreachMerge — Mail Merge for Outlook & Microsoft 365 (original) | — | — | Free | Mail merge has lived in Gmail forever. Outlook and Microsoft 365 finally get a real one. OutreachMerge runs personalized… |
| Google Mail Checker | 4.1 | 2M+ | Free | Displays the number of unread messages in your Google Mail inbox. You can also click the button to open your inbox. |
| GMass: Powerful mail merge for Gmail | 4.8 | 400K+ | Freemium | A powerful mass email and mail merge system for Gmail. |
| Mail Merge for Gmail - Mailmeteor | 4.8 | 60K+ | Freemium | Free mail merge & mass email tool for Gmail, with email tracking and auto follow-ups |
| mail.com MailCheck | 4.0 | 40K+ | Free | The safe way to access your personal mail. |
| Quillbot: AI Writing Assistant with Humanizer, Paraphraser & AI Detector | 4.7 | 5M+ | Free | Write better emails, essays and messages with Quillbot's Grammar Checker, Paraphrasing Tool, Generative AI, Summarizer and more! |
| DeepL: translate and write with AI | 4.7 | 4M+ | Free | Translate while you read and write with DeepL Translate, the world’s most accurate translator. |
| Mailtrack | 4.4 | 3M+ | Freemium | Salespeople and recruiters who need to know when an email was actually opened. |
| Apollo.io: Free B2B Phone Number & Email Finder | — | — | Free | Apollo enables users to find contact info, connect with buyers, track emails, and more for free. |
| HubSpot Sales | — | — | Free | Email tracking, CRM for Gmail, and sales productivity tools in your inbox |
| Email Finder by ContactOut – Email Lookup Tool | 4.4 | 600K+ | Free | Find emails for 75% of Linkedin or ANY website. Save profiles to CRM. Chatgpt comments & email writer. Trusted by 76% of Fortune500. |
Displays the number of unread messages in your Google Mail inbox. You can also click the button to open your inbox.
Why it replaces OutreachMerge — Mail Merge for Outlook & Microsoft 365: Covers similar ground in the Email category: Displays the number of unread messages in your Google Mail inbox. You can also click the button to open your inbox.
A powerful mass email and mail merge system for Gmail.
Why it replaces OutreachMerge — Mail Merge for Outlook & Microsoft 365: Covers similar ground in the Email category: A powerful mass email and mail merge system for Gmail.
Free mail merge & mass email tool for Gmail, with email tracking and auto follow-ups
Why it replaces OutreachMerge — Mail Merge for Outlook & Microsoft 365: Covers similar ground in the Email category: Free mail merge & mass email tool for Gmail, with email tracking and auto follow-ups
The safe way to access your personal mail.
Why it replaces OutreachMerge — Mail Merge for Outlook & Microsoft 365: Covers similar ground in the Email category: The safe way to access your personal mail.
Write better emails, essays and messages with Quillbot's Grammar Checker, Paraphrasing Tool, Generative AI, Summarizer and more!
Why it replaces OutreachMerge — Mail Merge for Outlook & Microsoft 365: Another popular Email extension: Write better emails, essays and messages with Quillbot's Grammar Checker, Paraphrasing Tool, Generative AI, Summarizer and more!
Translate while you read and write with DeepL Translate, the world’s most accurate translator.
Why it replaces OutreachMerge — Mail Merge for Outlook & Microsoft 365: Another popular Email extension: Translate while you read and write with DeepL Translate, the world’s most accurate translator.
Read receipts and link tracking for Gmail.
Why it replaces OutreachMerge — Mail Merge for Outlook & Microsoft 365: Another popular Email extension: Read receipts and link tracking for Gmail.
Apollo enables users to find contact info, connect with buyers, track emails, and more for free.
Why it replaces OutreachMerge — Mail Merge for Outlook & Microsoft 365: Another popular Email extension: Apollo enables users to find contact info, connect with buyers, track emails, and more for free.
Email tracking, CRM for Gmail, and sales productivity tools in your inbox
Why it replaces OutreachMerge — Mail Merge for Outlook & Microsoft 365: Another popular Email extension: Email tracking, CRM for Gmail, and sales productivity tools in your inbox
Find emails for 75% of Linkedin or ANY website. Save profiles to CRM. Chatgpt comments & email writer. Trusted by 76% of Fortune500.
Why it replaces OutreachMerge — Mail Merge for Outlook & Microsoft 365: Another popular Email extension: Find emails for 75% of Linkedin or ANY website. Save profiles to CRM. Chatgpt comments & email writer. Trusted by 76% of Fortune500.
Direct comparisons with the extensions people weigh against it.
Google Mail Checker is the closest match. Covers similar ground in the Email category: Displays the number of unread messages in your Google Mail inbox. You can also click the button to open your inbox.
Yes — Google Mail Checker, mail.com MailCheck, Quillbot: AI Writing Assistant with Humanizer, Paraphraser & AI Detector are free.
