Postmerge

What is Postmerge?

Postmerge is a Chrome extension that adds a personalized mail merge workflow to Gmail’s compose window. It helps you send the same email to many recipients while swapping in per-recipient values (for example, first names) from a list you paste.

The core purpose is to keep your sending in Gmail while letting you write once using {{variable}} placeholders and then preview and send individualized messages to each recipient.

Key Features

• Mail merge button in Gmail compose: Postmerge adds a “Mail Merge” control to the Gmail compose toolbar so you can create merges without leaving Gmail.
• Smart recipient import (CSV/TSV or email lists): You can paste a recipient list, and Postmerge auto-detects CSV, TSV (e.g., from Sheets/Excel), or a bare list of emails.
• Variable placeholders with one-click insertion: Write your message using {{columnName}}-style variables (e.g., {{firstName}}, {{company}}), with variable chips to insert placeholders from your data.
• Inline preview of personalized messages: Before sending, you can flip through each personalized message to verify how the merge resolves for each recipient.
• Preserves basic HTML formatting: Formatting such as bold, italic, and links survives the merge so your emails retain the structure you compose.

How to Use Postmerge

1. Install Postmerge from the Chrome Web Store.
2. Open Gmail and click Compose.
3. In the compose window, click the “Mail Merge” button that Postmerge adds to the toolbar.
4. Paste or provide your recipient list (CSV, TSV, or a plain list of emails). Postmerge will detect the format.
5. Write your message once, inserting placeholders like {{firstName}} as needed.
6. Use the inline preview to review the personalized messages.
7. Click Send to send the merge from your real Gmail address.

Use Cases

• Customer follow-ups with first-name personalization: Send follow-up emails to a list exported from Sheets/Excel while addressing each recipient with a variable such as {{firstName}}.
• Event invitations to many attendees: Personalize each invitation using recipient columns (e.g., names or company) without manually editing each email.
• Fundraising outreach: Use a single message template with {{…}} placeholders and preview each merged version before sending.
• Sales outreach to segmented lists: Paste a CSV/TSV of leads, insert variables corresponding to columns, preview results, then send from Gmail.
• Outreach where message consistency matters: Keep one drafted message (including formatting like links) while generating individualized versions for each recipient.

FAQ

• Does Postmerge send through a third-party relay? Postmerge sends messages from your own Gmail address, so recipients see your real address.

• What file formats or recipient inputs can I use? Postmerge can auto-detect pasted CSV, TSV (for example from Sheets/Excel), and a bare list of email addresses.

• Can I preview the personalized emails before sending? Yes. Postmerge provides an inline preview so you can flip through each personalized message prior to sending.

• Does Postmerge add tracking (opens or clicks)? No. Postmerge does not add tracking pixels or modify messages with opens/clicks tracking.

• Does Postmerge store my email content on its servers? The extension states that your email content goes browser-direct to Gmail’s API, and that it does not store message content on its servers other than subscription status.

Alternatives

• Gmail mail-merge tools from the same category: Other Gmail-oriented mail merge extensions typically focus on generating personalized messages from CSV/Sheet data; workflow differs based on how they handle preview and placeholder insertion.
• CRM/outreach platforms with mail merge: Tools centered on sales/marketing may integrate mail merge into a broader workflow (lists, sequences, segmentation), but they may not keep composing strictly inside Gmail the same way.
• Spreadsheet-to-email workflows (manual or semi-automated): Using exports from Sheets/Excel combined with templates can work, but it usually requires more manual editing compared with {{variable}}-based merging and inline preview.