01 / PREPARE
Add your recipient list
Choose a spreadsheet or your Outlook contacts. Use your columns for names, amounts and the files each person should receive.
Mail merge, inside Outlook
The right email.
The right attachment.
For every recipient.
Send personalized emails with individual attachments from your spreadsheet, right inside Outlook.
Free plan available. Requires a Microsoft 365 work or school account.
4.9/5 from 74 ratings on AppSource Made for your Outlook. New OutlookClassic OutlookMacWeb No Word required.
From spreadsheet to sent.
One list. Individual messages.
02 / PERSONALIZE
Write it once, in Outlook
Add personal details to your subject and message. Keep your signature, formatting and images, with individual CC or BCC recipients.
03 / CHECK & SEND
See it before they do
Review your recipients and send yourself a test. Then generate your campaign for immediate or scheduled sending.
Pick a use case
| Recipient | Invoice | Amount | Attachments |
|---|---|---|---|
| Jamie Chen | INV-1042 | €240.00 | INV-1042-Jamie-Chen.pdf |
| Priya Shah | INV-1043 | €480.00 | INV-1043-Priya-Shah.pdf |
| Alex Morgan | INV-1044 | €360.00 | INV-1044-Alex-Morgan.pdf |
2. Their individual email
- To
- Jamie Chen
- Subject
- Your September invoice INV-1042
Hi Jamie,
Your September invoice INV-1042 for €240.00 is attached. Thank you for working with us.
INV-1042-Jamie-Chen.pdf
From the Attachments columnExplore the features
Simple to start.
Ready for the details.
From a quick announcement to invoices, reports and complex recipient lists. Build the mail merge your work actually needs.
Messages & attachments
- Different attachments for each recipient
- Match filenames in your spreadsheet to invoices, letters or reports. Include multiple files for one person, or a common attachment for everyone.
- Your full mailbox size allowance
- SecureMailMerge adds no message or attachment size cap. Your Microsoft 365 mailbox and receiving systems still set the limits.
- Individual CC and BCC recipients
- Copy the same people on every email, use different addresses for each row, or combine both approaches.
- A separate reply-to address
- Send from your address and route responses to a colleague or team inbox. Set one reply-to address for the campaign.
- Send from your account or an alias
- Send through your own Microsoft 365 account. Use a sending alias when your organization has enabled it.
- Shared mailbox sending
- Start in your own mailbox and change the "From" address, with Send As permission. Sent messages are saved in your own Sent Items folder.
- Custom headers and unsubscribe links
- Add a custom header for your mail flow rules or a List-Unsubscribe value pointing to your own unsubscribe destination. You manage unsubscribe requests.
Sending & control
- Start dates, weekdays and sending hours
- Choose when messages go out. Keep Outlook open while messages are generated; once submitted, Microsoft 365 sends them on schedule even with Outlook closed.
- Message delays and daily caps
- Set the delay between messages and the maximum sent each day. Your start date, weekdays, hours and daily limit work together.
- Test emails and time to review
- Send yourself a test immediately. A separate delay before the first campaign message gives you time to inspect the generated drafts. Sending starts automatically when the delay ends.
- Pause, resume or cancel a campaign
- Control campaign generation and resume after reopening the add-in. Messages already submitted to Microsoft 365 keep their schedule.
- Download a detailed send report
- Keep an Excel record of row status, attachments, submission times and message IDs. Submission records are not confirmation of delivery.
- Receipts and high importance
- Request read or delivery receipts and mark messages as important. Receipt availability depends on the recipient and receiving email system.
- No additional recipient cap
- Use the sending allowance of your Microsoft 365 mailbox on either plan. Microsoft and your organization’s limits still apply.
- Remember your campaign settings
- Reuse advanced options for your next campaign. Review the active settings before sending; the start date is set separately for each campaign.
Personalization
- Personalized subjects and messages
- Insert spreadsheet or contact fields into your subject and email body, from a first name to an invoice amount.
- Conditional content
- Show different text based on your data, so each customer, colleague or department gets the information relevant to them.
- Fallback values for missing data
- Choose alternative text for empty fields. A missing first name does not have to leave an unfinished greeting.
- Rich Outlook formatting
- Keep your tables, images, signatures and familiar Outlook formatting. Send yourself a test to check the finished message.
- Individual links and date formatting
- Give each recipient their own link and control how spreadsheet dates appear in the message.
Recipients & data
- Excel, CSV and other spreadsheets
- Use Excel, CSV, TXT, Numbers, OpenDocument, Works, HTML tables, Quattro Pro or Lotus files. Start with the recipient list you already have.
- Personal and shared Outlook contacts
- Choose recipients from your personal or shared address book. Personalize with names, companies, departments and other contact details.
- Review, search and select recipients
- Search, sort and filter the recipient table in the add-in, then untick anyone to skip. Hiding or filtering rows in your spreadsheet does not exclude them.
- Many-to-one mail merge
- Combine multiple rows for one recipient into a single email with a table. Attachments and CC/BCC addresses from those rows are combined and deduplicated.
Every feature, on both plans. Choose your plan
Use it free with a promotional footer, or remove the footer with a license.
Built around your data
Your campaign stays
under your control.
Your spreadsheet and message content are processed on your computer inside Outlook.
Finished emails are sent through your own Microsoft 365 mailbox.
Unlike many other mail merge tools, your campaign data is never sent to any server for processing. Not ours, not anyone else's.
Share the Trust Center with ITWhere your campaign data goes
Your spreadsheet & attachments
Selected from your files
Processed on your computer
Individual messages created inside Outlook
Sent through Microsoft 365
From your account to your recipients
Microsoft permissions and your organization’s policies still apply.
Less repetitive work. More time back.
“Game Changer. The Outlook integration and ability to attach docs make this tool invaluable for our daily activity.”
Microsoft AppSource review · Jan 25, 2026
“Remarkable! This is the BEST program I have found for sending bulk emails. Literally days of work compressed into minutes.”
Microsoft AppSource review · Dec 6, 2024
“Amazing Time Saver. I have been looking for this product my whole career! Saves me so much time sending the same email over and over with a different attachment.”
Microsoft AppSource review · May 29, 2024
All the features. A simple choice.
Free with a promotional footer. One price to remove it. No hidden fees.
Free version
For anyone. Every feature, no time limit, no credit card
Free
No subscription required.
- All features, unlimited campaigns*
- Adds a short promotional footer to each email
License
One license per sender, reassignable within your subscription
See current price at checkout per month
Billed monthly. Renews until cancelled.
- All features, unlimited campaigns*
- No promotional footer
- Pay by card, PayPal or through your Microsoft 365 subscription
License (annual)
One license per sender, reassignable within your subscription
See current price at checkout per year
Billed annually. Renews until cancelled.
- All features, unlimited campaigns*
- No promotional footer
- Pay by card, PayPal or through your Microsoft 365 subscription
Prices are shown in your local currency and may vary by country.
Prices are excluding applicable taxes which will be added on checkout.
*SecureMailMerge has no restrictions on the number of campaigns, emails or attachments, but Microsoft 365 or your organization may impose limits.
Will it work with my Microsoft account?
You need a Microsoft 365 work or school account. New Outlook, classic Outlook, Outlook for Mac and Outlook on the web are supported. Outlook.com, Hotmail and Microsoft 365 Personal, Family or Home accounts are not supported.
Check account requirementsWill I need permission from IT?
Your organization may require administrator approval. SecureMailMerge needs Microsoft permissions to work with messages and send on your behalf. Your IT team can review the permissions and deployment guidance before you install.
Read the permissions guideCan I send from a shared mailbox?
Yes. Install the add-in on your own mailbox, then choose the shared address in the "From" field. Your administrator must grant Send As permission. Sent messages are saved in your own Sent Items folder. Running the add-in directly inside a shared mailbox is not supported.
See shared mailbox setupWhat does the free version include?
Every mail-merge feature, with no time limit or credit card required. The free version adds a short promotional footer to each email. A paid license removes it. Both versions are subject to Microsoft 365 and organizational sending limits.
Compare the plansHow do I cancel a paid subscription?
You can cancel at any time. Subscriptions renew automatically until cancelled, and your licenses remain active until the end of the paid term. Cancel website purchases through the licensing server and Microsoft purchases in the Microsoft 365 admin center.
See cancellation instructionsMake the next mail merge easier.
Your spreadsheet. Your Outlook. A personal email for every recipient.