Send a Letter to Multiple Addresses at Once Online

You need to send the same letter to dozens—or hundreds—of people, but you don't want to write, print, stuff, and stamp each one individually. Bulk mail merge letters online lets you type your message once, upload a recipient list, and have Sent Instantly print and mail personalized copies to every address on your list, all in one order.

What is bulk mail merge for letters?

Why choose bulk mail merge instead of printing and mailing yourself?

Printing and mailing 50 or 100 letters yourself means buying paper, ink, envelopes, and stamps; printing each one; stuffing and addressing by hand; and making a trip to the post office. That's hours of work, not counting the cost of supplies. Bulk mail merge through Sent Instantly eliminates all of that—you upload your list, type your message once, and we handle the rest.

Beyond time savings, a done-for-you service ensures consistency. Every letter is printed the same way, sealed, and mailed USPS First-Class. You avoid the risk of typos, missing stamps, or incorrect postage. For small-business owners, property managers, realtors, and nonprofits sending move-in notices, past-due letters, outreach campaigns, or donor appeals, this reliability is critical.

How does bulk mail merge work?

• Write your letter once in the bulk mail merge, using merge fields for each recipient's details.
• Upload your recipient list as a CSV file with names, addresses, and any personalization fields you want to include (up to 400 recipients per upload).
• Preview your letters and confirm your order and total cost.
• Sent Instantly prints each letter personalized with recipient details, folds it into an envelope, and mails it USPS First-Class.
• Each letter is mailed USPS First-Class; bulk letters have no tracking number.

Can I personalize each letter in a bulk mail merge?

Yes. When you upload your recipient list, you can include fields like first name, last name, account number, or property address. Your message can reference these fields so each letter feels individually written. For example, a property manager can send a notice that reads, 'Dear [First Name], regarding your lease at [Property Address]...' and every recipient sees their own details filled in.

This personal touch is one reason bulk mail merge is so effective for business outreach. Recipients feel the letter was written for them, not a generic mass mailing. You get the efficiency of sending to hundreds of people with the impact of individual correspondence.

What can I send with bulk mail merge?

Letters. Every letter in a bulk mail merge is printed in a handwriting-style script, folded into its own envelope, and mailed USPS First-Class. You choose the occasion (thank you, business, congratulations, holiday, or just because) and the handwriting style. Postcards, greeting cards, and letterhead are not offered.

How fast does a bulk mail merge campaign arrive?

Delivery time depends on the carrier and the distance to each recipient. Bulk letters are mailed USPS First-Class, without tracking; a single Certified or flat letter comes with a tracking number, emailed to you.

For time-sensitive mailings—like a move-in notice that needs to arrive by a specific date or a last-minute outreach push—order early: bulk letters have no tracking, and delivery time depends on the carrier.

What are common uses for bulk mail merge letters?

• Property managers sending lease renewals, move-in packets, or past-due notices to tenants.
• Small-business owners mailing customer announcements, payment reminders, or thank-you letters.
• Realtors and sales reps sending handwriting-style prospecting letters or market-update letters to a target list.
• Nonprofits mailing personalized donor appeals or impact updates to supporters.
• Loan servicers, utilities, or service providers sending account notices or policy changes to customers.
• Event organizers sending invitations or follow-up thank-you notes to attendees.

How much does bulk mail merge cost?

Bulk mail merge letters are $3 each, $2.50 each from 10, or $2 each from 50, folded and mailed USPS First-Class, with printing and postage included. A single letter sent on its own is from $3: $3 First-Class, $11 Certified or $15 flat with tracking. You see the exact total before you pay.

For businesses sending regular campaigns, bulk mail merge is almost always cheaper than DIY printing and mailing—you save on supplies, time, and the mental load of managing the task. Compare the all-in cost (your time, materials, postage) against the per-letter rate you see at checkout to confirm the value for your use case.

What file format do I use for my recipient list?

Upload your recipient list as a CSV (comma-separated values) file, up to 400 recipients per upload. It needs columns for name and full address (street, city, state, and ZIP). Any extra column, such as company, account number, or property address, becomes a merge field you can use in your letter.

Do I need to upload your address list to use bulk mail merge?

Yes, uploading a recipient list is what makes bulk mail merge work. You can also send a single letter if you only have one address, but bulk mail merge is designed for multiple recipients. If you have 10 people or 1,000, the process is the same: upload your list, preview, and send.

Frequently Asked Questions

Can I send a letter to multiple addresses at once without printing it myself?

Yes. With bulk mail merge, you upload your recipient list, and Sent Instantly prints and mails each personalized letter for you. No printer, ink, envelopes, or post-office trip needed.

How do I mail the same letter to many addresses at once online?

Upload a CSV of recipient names and addresses to Sent Instantly's bulk mail merge, write your message once with merge fields, preview your letters, and submit. Sent Instantly handles printing and mailing.

Do handwriting-style letters look like real handwriting in a bulk mail merge?

Each letter in your bulk campaign is printed in a handwriting-style script, so it reads as personal rather than typed. No one writes the letters with a pen. It's effective for personal outreach and prospecting.

How long does it take for a bulk mail merge letter to arrive after I send it?

Delivery time depends on the carrier and the distance to each recipient. Bulk letters are mailed USPS First-Class, without tracking; a single Certified or flat letter comes with a tracking number, emailed to you.

Can I track my bulk mail merge campaign?

No. Bulk letters are mailed USPS First-Class, without tracking; a single Certified or flat letter comes with a tracking number, emailed to you. You can also look up a tracking number on the site's tracking page.

What if I have errors in my recipient list?

Review your list carefully before you submit your order. If you spot errors after ordering, contact Sent Instantly support to see if corrections can be made before printing. Undeliverable mail is returned, and you can request a refund or resend for corrected addresses.

Bulk mail merge is the fastest, easiest way to send a real, physical letter to a whole list of people without doing any of the manual work yourself. Whether you're a property manager, small-business owner, realtor, or nonprofit, Sent Instantly takes the friction out of multi-recipient campaigns so you can focus on your message and your relationships.

Ready to send your bulk mail merge campaign?

Start by gathering your recipient list and drafting your message. Then head to Sent Instantly's bulk mail merge, upload your addresses, write your letter once, and review the total before you pay—no printing, stuffing, or stamps required.