COMPARISON
PostKnock vs Mailjoy
Mailjoy is a solid self-serve postcard and letter tool — drag-and-drop design, no minimums, pay-as-you-go. PostKnock is also self-serve and no-minimum, but built specifically for service businesses where a postcard is step one of a sequence — followed by a phone call, then a second postcard, then another call. Same starting point, different shape on the back end.
| Feature | PostKnock | Mailjoy |
|---|---|---|
| Self-serve design editor | ✓ | ✓ |
| Minimum order | None | None |
| Free signup (no credit card) | ✓ | ✓ |
| Phone follow-up calls | ✓ Built-in (Pro) | Not offered |
| Multi-wave campaign sequences | ✓ Up to 5 waves | Single-send |
| Industry playbooks (Dental, HVAC, Optometry, +20 more) | ✓ | Generic templates |
| AI background images (text-to-image) | ✓ 10/mo Free, 50/mo Pro | Not advertised |
| QR code tracking | ✓ | ✓ |
| 4×6 postcard — pay-as-you-go | $1.05 (Free) | $0.90 |
| 4×6 postcard — paid plan | $0.79 (Pro, $99/mo) | $0.85 (Credit plan, $128/mo for 150) |
| 6×9 postcard — pay-as-you-go | $1.09 (Free) | $1.20 |
| Letters | Not offered (postcards focus) | ✓ |
| Cancel anytime | ✓ | ✓ |
Mailjoy pricing per mailjoy.com/pricing.html at time of publish (PAYG: 90¢ standard 6×4, $1.20 large 9×6, $1.50 wide 11×6; credit plans start at $128/mo for 150 4×6 credits). Pricing changes — check Mailjoy's site for the latest.
No credit card. No minimum. Free sample postcard mailed to you.
Why service businesses pick PostKnock as their starting point
Mailjoy is a great postcard sender. If all you need is to mail a postcard or a letter from a drag-and-drop tool, Mailjoy works well — and at $0.90 pay-as-you-go for a 4×6, the per-piece is genuinely competitive at small volume.
PostKnock is built for the workflow that comes after the postcard. For dental offices, HVAC shops, optometry clinics, and vets, a single postcard rarely closes the loop. The pattern that works is postcard → phone call → second postcard → another phone call → results. PostKnock builds that entire sequence into one Pro plan, with industry-specific call scripts and timing that fires automatically once a postcard is delivered.
Industry playbooks instead of blank templates. Pick "Dental Recall" or "HVAC Spring Tune-Up" or "Optometry Annual Exam" and the headline, offer, CTA, wave timing, and call scripts are filled in. You can edit anything, but you start from something that works — not from a blank canvas.
One Pro fee gets you the whole workflow. $99/mo unlocks multi-wave campaigns, phone follow-up calls, industry playbooks, and the bigger per-piece discount ($0.79 vs $1.05 for 4×6). For comparison, Mailjoy's smallest credit plan is $128/mo for 150 credits at $0.85 each — postcards only, no calling, no sequencing.
Start free, ramp when it's working. The Free plan is genuinely free — $0/mo, no card, no time limit. Send a 50-card pilot to your top reactivation contacts, see what comes back, and upgrade to Pro only when you're ready to layer on phone follow-ups and a second wave.
When Mailjoy is the right call
Mailjoy is a good pick if you want a clean self-serve postcard or letter sender for one-off mailings. E-commerce welcome cards, real estate just-listed mailers, marketing-driven postcard pushes that don't need a follow-up workflow. The drag-and-drop editor is straightforward, pricing is published, and there's no minimum. If your job is "send a batch of postcards," Mailjoy will get you there.
When PostKnock is the right call
PostKnock is for service businesses where the postcard is part of a bigger sequence. The user is a dental office owner who needs to reactivate 300 lapsed patients — and that means postcard, then phone call to the people who don't book, then a second postcard, then another round of calls. PostKnock builds that whole motion into a single campaign with one click. Mailjoy doesn't have an equivalent — you'd run the sequence by hand across multiple sends.
Pricing side-by-side
At small volume (pay-as-you-go, postcards only): Mailjoy is cheaper. $0.90 vs $1.05 for a 4×6. If you're sending 50 cards and that's the whole project, Mailjoy will cost less.
At higher volume on a paid plan: PostKnock Pro comes out ahead on both the monthly fee ($99 vs $128) and the 4×6 rate ($0.79 vs $0.85) compared with Mailjoy's smallest credit plan — and PostKnock Pro also includes the phone follow-up workflow and multi-wave sequencing that Mailjoy doesn't offer.
The honest take: if you only need to send postcards, Mailjoy is competitive at low volume. If your business benefits from postcards plus phone follow-ups in a multi-wave sequence, PostKnock includes the whole thing in one Pro plan.
Trying PostKnock alongside Mailjoy
There's no migration to do — both tools work from a CSV. Easiest way to evaluate:
- Sign up for PostKnock (free, no credit card)
- Upload a small list (your top 100 reactivation contacts) and pick an industry playbook
- Customize headline, offer, and CTA — or accept the defaults and move on
- Preview the print proof, launch, and see whether the playbook + call workflow fits your business
Frequently Asked Questions
What's the main difference between PostKnock and Mailjoy?▼
Both are self-serve direct mail tools with no minimums and a free signup. Mailjoy is primarily a postcard and letter sender. PostKnock adds the rest of the workflow on top — phone follow-up calls (with industry scripts and a call queue), multi-wave campaign sequencing, and industry playbooks for dental, HVAC, optometry, and 20+ other verticals. If you need to send a postcard, Mailjoy works. If you need a full reactivation workflow, PostKnock includes it.
Is PostKnock more expensive than Mailjoy?▼
At small volume on pay-as-you-go, Mailjoy's 4×6 is cheaper per piece ($0.90 vs PostKnock Free at $1.05). At higher volume on a paid plan, PostKnock Pro is cheaper on both monthly fee ($99 vs $128) and per-card ($0.79 vs $0.85) compared with Mailjoy's smallest credit plan — and Pro includes phone calls and sequencing too. Pick based on what your workflow actually needs.
Does Mailjoy do phone follow-up calls?▼
Mailjoy is focused on direct mail (postcards and letters). PostKnock Pro includes a built-in call queue, industry-specific call scripts, and per-wave timing — your front desk gets a daily list of people to call, with the right script for each one.
Can I import my Mailjoy contacts into PostKnock?▼
Yes. PostKnock accepts CSV and Excel files with auto column-mapping. If your contact list lives in Mailjoy or in your CRM, export it as CSV and you'll be set up in PostKnock in a few minutes — no separate import process required.