Mailbox Engine vs. ProspectsPLUS!: Farming Postcards or a Full Client Program?
ProspectsPLUS! specializes in real estate farming postcards and print. Mailbox Engine automates cards, postcards, and gifts for past clients and policyholders. Compare pricing with postage, automation, tracking, and fit.
By the Mailbox Engine team · · 5 min read
Key takeaways
- ProspectsPLUS! is a real estate print specialist with mailed postcards, EDDM, magazines, door hangers, and free agent templates.
- Its mailed First-Class standard postcard runs $0.94 to $1.13 with postage, and there is no membership fee.
- Mailbox Engine includes unlimited small postcards plus 50 to 200 mailed greeting cards a month, with birthday and anniversary automations.
- For a 50-card, 200-postcard monthly program, Mailbox Engine Basic totals $270.99; ProspectsPLUS! comes to about $384.50 before you stamp and mail the cards yourself.
ProspectsPLUS! has served real estate agents for years with one focus: getting professional listing and farming materials in front of homeowners. Postcards, EDDM, magazines, door hangers, and newsletters, with a large library of agent-ready designs (ProspectsPLUS!). Mailbox Engine focuses on the other half of an agent's business: the past clients, sphere, and referral partners who already trust you, reached automatically with cards, postcards, and gifts.
Most agents need both kinds of mail. The question is which one your business is missing.
The short answer
Best fit
Choose Mailbox Engine if…
- Your growth depends on repeat clients and referrals.
- You want birthdays and home anniversaries sent automatically, every year.
- You want to mail greeting cards and gifts, not only postcards.
- You want QR alerts naming who scanned and a connection to your CRM.
Also a fit
Choose ProspectsPLUS! if…
- You are farming a neighborhood and want a big library of listing designs.
- You want EDDM, magazines, door hangers, or oversized postcards.
- You prefer pay-per-order with no membership.
- You want Listing Lens AI to target homes predicted to list.
Side-by-side comparison
From each company's public pages, checked October 6, 2026.
| Mailbox Engine | ProspectsPLUS! | |
|---|---|---|
| Built for | Automated relationship mail: cards, postcards, gifts | Real estate prospecting print and farming |
| Pricing model | Membership: Basic $99.99/mo, Professional $199.99/mo, no contracts | Pay per order (pricing) |
| Postcards | Small postcards free on every plan + 65¢ First-Class postage | Mailed First-Class standard postcard $1.13 down to $0.94 with postage; jumbo $1.46 down to $1.24 |
| Greeting cards | 50 (Basic) or 200 (Professional) per month included, mailed with a real stamp | $2.95 down to $1.20, shipped to you; mailing not stated |
| Gifts | Hundreds of personalized gifts | Not listed |
| Automation | Birthday, anniversary, scheduled follow-ups, nearest neighbor (Pro) | Schedule postcards for future dates; automated campaign of 100 jumbo postcards/mo for $131 |
| Formats | Cards, postcards, letters, gifts | Postcards up to 15x12, EDDM, magazines, flyers, door hangers, newsletters |
| Templates | Ready-made campaign templates and automations | Free agency-designed real estate templates |
| Tracking | Unique QR per recipient; scan alerts naming the person (Professional) | Mail tracking included; QR alerts not listed |
| Lists | AI-assisted list builder with cost shown before purchase; Visitor Reveal | Mailing lists from 8¢ per record; Listing Lens AI |
| Integrations | CRM integrations incl. Follow Up Boss, Zapier, API & webhooks | Not listed |
| Speed | Most items printed and mailed the next business day | Mailed the next business day |
Pricing: postcards, cards, and postage
ProspectsPLUS! publishes clear, all-in pricing for mailed postcards. A standard 5.5x4.25 postcard mailed First-Class is $0.98 each at 200 to 499 pieces, including printing, addressing, and postage (ProspectsPLUS!). Mailbox Engine includes unlimited small postcards in every membership, so each one costs the 65¢ USPS First-Class postcard rate (USPS).
A typical past-client program: 50 cards and 200 postcards a month
| Line item | Mailbox Engine Basic | ProspectsPLUS! |
|---|---|---|
| Membership | $99.99 | None |
| 200 postcards, mailed | $130.00 (postage only) | $196.00 ($0.98 each) |
| 50 greeting cards | Included, mailed for you | $147.50 ($2.95 each, shipped to you) |
| Card postage | $41.00 | $41.00 if you stamp and mail them |
| Monthly total | $270.99 | About $384.50, plus your time |
For a deeper look at what a farm costs over a year, see real estate farming postcards cost and our direct mail cost per piece guide.
Automation: set it once vs. order each time
ProspectsPLUS! lets you schedule postcards for future dates, including holidays and birthdays, and offers an automated monthly campaign. Its pricing page does not describe recurring date-based automations that run every year from a contact's details, CRM triggers, or integrations.
Mailbox Engine is built around those automations. Add a client with a birthday and closing date, and every year they receive a birthday card and a home anniversary card, with scheduled follow-ups after closing and ready-made templates for referrals and reactivations. A stage change in Follow Up Boss or another connected CRM can start a campaign automatically. Our real estate referral system shows how those touches add up to repeat business.
Prospecting tools on both sides
Both platforms help you find new homeowners to mail. ProspectsPLUS! sells mailing lists from 8¢ per record and offers Listing Lens AI to target homes it predicts are likely to list. Mailbox Engine includes an AI-assisted list builder (consumer, business, new mover, and new homeowner lists, with the cost shown before you buy), Visitor Reveal for website visitors, and, on Professional, Nearest Neighbor mailing that sends a postcard to up to five nearby homes whenever you add a client.
For prospecting copy, our expired listing letter template, FSBO letter template, and just sold postcards guides work with either platform. Keep the NAR Code of Ethics in mind: general mailings to everyone in an area are allowed even if some homes are listed, but targeted solicitation of another broker's exclusive listings is not (NAR Standard of Practice 16-2).
Tracking and ROI
ProspectsPLUS! includes mail tracking on its mailed postcards. Mailbox Engine's Professional plan adds a unique QR code to each piece and texts you the name of whoever scans, so you know which homeowner is ready for a conversation. See how to track direct mail with QR codes.
Which should you choose?
If you need a high-quality farm postcard, EDDM, or a listing magazine, ProspectsPLUS! is an established real estate print shop. If you want past clients, your sphere, and referral partners to hear from you automatically all year, with cards, gifts, and tracking in one place, Mailbox Engine is built for that job. Many agents use a print shop for the farm and Mailbox Engine for the relationships.
Compare Mailbox Engine with PostcardMania, thanks.io, Handwrytten, and SendOutCards, or see the direct mail platform roundup.
Sources & further reading
- 01ProspectsPLUS!: pricing
- 02ProspectsPLUS!: home
- 03USPS: new mailing prices for July 2026
- 04USPS Household Diary Study FY2023 (Table 5.11)
- 05NAR 2025 Profile: typical seller tenure
- 06NAR 2025 Profile of Home Buyers and Sellers: referrals and repeat use
- 07NAR Code of Ethics, Article 16 and Standard of Practice 16-2
Frequently asked questions
Is ProspectsPLUS! good for farming?
Yes. ProspectsPLUS! is built for real estate farming, with mailed postcards, EDDM, larger formats like panoramic and mega postcards, magazines, and a large library of free agent templates. Mailbox Engine is built for past clients, sphere, and referral relationships.
Does ProspectsPLUS! automate birthday cards?
ProspectsPLUS! lets you schedule postcards for future dates such as holidays and birthdays, and offers an automated monthly campaign. Its pricing page does not describe CRM-triggered or recurring birthday and anniversary automations. Mailbox Engine includes those automations on every plan.
Which is cheaper?
For postcard-only farming at modest volume, ProspectsPLUS! can cost less because there is no membership fee; its automated campaign of 100 jumbo postcards a month is $131. For a mixed program of greeting cards and postcards to past clients, Mailbox Engine usually costs less.
Can I use both?
Yes. Some agents farm a neighborhood with ProspectsPLUS! print and use Mailbox Engine for the one-to-one touches that keep past clients and referral partners close.
Put this on autopilot.
Mailbox Engine personalizes, prints, packs, and mails your cards, postcards, and gifts on schedule — with QR scan tracking built in. Plans start at $99.99/mo.