One-Time-Fee Newsletter Plugins vs Monthly ESP Pricing
Email is one of the few software categories where you can still buy something once. Most of the market bills monthly and scales that bill with the size of your list, which means the cost of a subscriber acquired three years ago never stops. A handful of WordPress plugins sell a licence instead, and the difference compounds in a way that is easy to underestimate.
This article models three pricing structures at three list sizes over five years, then does the harder part: naming exactly what the monthly fee buys, because a cost comparison that pretends the answer is “nothing” would be misleading.
Verified August 2026. Provider pricing changes frequently and varies by feature tier; the figures here show the shape of the comparison, so price your own list before deciding.
Three pricing models
Per subscriber, monthly. The dominant model. You pay for the size of your list whether you email it or not, and the bill rises in bands as the list grows. Its logic is that a larger list means more value, which is often true and occasionally very much not.
Per site, annually. A flat licence for the software, unrelated to how many contacts you hold. FluentCRM at $103, $199 and $399 a year is the clearest example: the tiers count websites, not people. Delivery is separate and you arrange it.
One-time. Buy the plugin, own it. Mailster is the best-known example in this category. Updates and support usually continue for a defined period, and the software keeps working regardless. Again, delivery is yours to arrange.
The critical thing to hold onto is that models two and three both split software from sending. The comparison is never “plugin versus provider”; it is “plugin plus delivery service versus provider”. Delivery through a cloud sending service is inexpensive, but it is not zero and it is not free of effort.
Five-year totals at three list sizes
At 2,000 subscribers. Provider plans at this size are commonly in the region of $30 a month, so roughly $360 a year and $1,800 over five years. FluentCRM is $103 a year, or $515 across five years, plus modest delivery costs. A one-time licence is a few hundred dollars once, plus the same delivery. The self-hosted routes win, but by an amount a small business might reasonably trade for convenience.
At 20,000 subscribers. Provider pricing at this size commonly sits well over $100 a month, so $6,000 to $9,000 over five years depending on features. The per-site licence is still $515 across five years because it does not care how many contacts you hold. The one-time licence is still a few hundred dollars, once. Sending 80,000 emails a month through a cloud service is perhaps ten dollars a month. The gap is now several thousand dollars, which pays for a great deal of setup time.
At 50,000 subscribers. Provider costs typically pass $250 a month, so $15,000 or more over five years. The self-hosted software cost has not moved at all. Delivery rises with volume but remains in the low tens of dollars monthly. At this size the arithmetic stops being a discussion, which is why nearly every large self-hosted list is on one of these two models.
Notice what actually drives the divergence: it is not that the plugins are cheap, it is that their price is flat. The provider’s cost curve bends upward with your success, and the plugin’s does not.
The 6 options compared
1. Mailster
The one-time purchase, and the option whose economics are most extreme at scale.
Buy it once and the software cost is settled forever, which against a provider bill that grows with your list is a difference measured in thousands over five years. What justifies the licence beyond price is the engineering underneath: queueing, batching, retry logic and bounce handling built for lists in the tens of thousands. Those are exactly the parts that fail when a lighter plugin is asked to send 80,000 emails. Support and updates run for a defined window rather than indefinitely, so check the current terms, and budget for renewing that if you want to stay current. It is the most technical product here, and the one that assumes you will take sending seriously.
- Pricing model: One-time licence
- Scales with list: No
- Best for: Large lists sending frequently
- Watch out for: Support and update windows are finite
2. FluentCRM
The per-site model, stated plainly by the vendor: plans are priced by number of websites, not by list size. $103, $199 and $399 a year, unlimited contacts at every tier.
That single decision is what makes it the strongest value in this comparison for anybody whose list is growing. Adding 40,000 contacts changes nothing about your bill. On top of the pricing you get a real CRM: tags, segments, automation sequences, contact activity histories and deep integrations with commerce and membership plugins, which is a materially different product from a newsletter sender. For a course business, a store or a membership site, that combination is close to unbeatable. The annual renewal means it is not quite the cheapest possible option over ten years, but it buys continuous development, which a one-time licence eventually does not.
- Pricing model: Per site, annual
- Scales with list: No
- Best for: Customer lists needing automation
- Watch out for: Annual renewal continues indefinitely
3. The Newsletter Plugin
The zero-cost floor of this comparison, with no subscriber cap and a long record behind it.
If your requirement is campaigns to a large list and nothing more elaborate, the software can cost you nothing at all, leaving delivery as your only expense. Over five years at 20,000 subscribers that is the difference between roughly $600 of sending and $7,000 of subscription, which is a striking way to state the same arithmetic the paid plugins make. The costs are in interface quality and in features: the composer is dated, automation is limited, and add-ons fill gaps you may or may not encounter. For a publisher with a big list and a small budget, it remains the most efficient answer in the category, and the money saved buys better hosting, which matters more.
- Pricing model: Free, with paid add-ons
- Scales with list: No
- Best for: Large lists, minimal budget
- Watch out for: Dated interface, limited automation
4. MailPoet
The plugin that uses the provider model, which makes it the useful middle case. Free to 500 subscribers and 5,000 emails a month, Business plans from around $10 a month scaling with list size.
It sits inside WordPress but bills like a service, which means it inherits both sets of characteristics. You get the convenience of bundled sending and a genuinely excellent composer, and you also get a bill that grows as your list does. For a store under a few thousand subscribers that is a sensible trade, particularly given how deep its commerce integration runs. Above that, the per-subscriber curve reasserts itself and the flat-priced alternatives pull away. You can point it at your own cloud sending credentials to remove the delivery portion of the cost, which helps, but the plugin subscription still scales. Good product, pricing model that limits how far it travels.
- Pricing model: Per subscriber, monthly
- Scales with list: Yes
- Best for: Stores under a few thousand subscribers
- Watch out for: The curve bends upward as you grow
5. Noptin
The lightweight uncapped option, worth including because the cheapest correct answer is sometimes a small plugin.
No subscriber limit, a free tier that covers signup forms, list management and post notifications, and paid tiers for extras. Where it earns its place in a pricing comparison is that plenty of sites paying a provider $30 a month are using perhaps a tenth of what that provider offers. If your actual requirement is “collect email addresses and tell people when I publish”, a small plugin plus a delivery service costs almost nothing and does the entire job. The discipline is in being honest about your requirement rather than buying for the version of your business you imagine in two years. If segmentation and automation genuinely matter, look elsewhere.
- Pricing model: Free, with paid tiers
- Scales with list: No
- Best for: Simple requirements, honestly assessed
- Watch out for: No real automation
6. Staying with an email service provider
The expensive option, and the correct one when email is how you make money.
The fee buys deliverability as a managed service. The provider maintains relationships with inbox providers, watches their sending pools, handles blocklist removal and employs people whose job is making sure your mail arrives. It buys you support with an accountable party at the other end, mature reporting, and templates tested against every mail client. Above all it buys the absence of a category of problem: when a large mailbox provider starts filtering, that is their emergency rather than your evening. Move self-hosted and every one of those becomes yours. If email drives your revenue and nobody on your team wants to read bounce logs, several thousand dollars over five years is a rational price for that.
- Pricing model: Per subscriber, monthly
- Scales with list: Yes, steeply
- Best for: Email as a primary revenue channel
- Watch out for: Cost never stops rising with success
Comparison table
| Option | Model | Five years at 2k | Five years at 20k | Delivery included |
|---|---|---|---|---|
| Mailster | One-time | Licence once | Licence once | No |
| FluentCRM | Per site | $515 | $515 | No |
| The Newsletter Plugin | Free | $0 | $0 | No |
| MailPoet | Per subscriber | From $600 | Scales up | Yes |
| Noptin | Free plus paid | Near zero | Near zero | No |
| ESP | Per subscriber | About $1,800 | $6,000 or more | Yes |
The hidden cost: reputation becomes yours
The saving is real and it is not free. What you take on when you move sending in-house is a set of responsibilities that were previously invisible because somebody else was handling them.
- Sender authentication is now your job. Domain verification and the authentication records that prove you are entitled to send are the difference between the inbox and the spam folder. Get these right before the first campaign.
- Bounce processing is mandatory. Hard bounces must be removed automatically. Ignore this and your bounce rate climbs until your sending service suspends the account, which is the most common self-hosting failure.
- Complaint rates need watching. Spam complaints above a fraction of a percent put your sending at risk. Prune inactive subscribers and make unsubscribing trivially easy, because an unsubscribe is far cheaper than a complaint.
- Warm-up is not optional. A new sending identity mailing 50,000 people on day one looks like an incident. Ramp over two or three weeks, starting with your most engaged segment.
- Nobody is monitoring but you. There is no dashboard warning you that a large provider began filtering last Tuesday. Check your delivery logs and open rates for changes, because the failure is silent.
- Your host is now part of the system. A reliable cron job and hosting that can run a queue for hours are prerequisites, not details.
Budget a day for initial setup and an hour or two a month for monitoring. At 20,000 subscribers, saving several thousand dollars over five years for that effort is an excellent trade. At 2,000 subscribers it is much closer, and choosing convenience is a defensible answer rather than a failure of nerve.
Frequently asked questions
At what list size does self-hosting pay off?
Around 5,000 subscribers it becomes arguable and by 20,000 it is usually decisive, because the plugin cost stays flat while provider pricing keeps climbing.
Does a one-time licence include updates forever?
Usually updates and support run for a defined window and the software keeps working afterwards. Check the current terms, and budget for renewal if staying current matters.
Is delivery really that cheap?
Cloud sending is a fraction of a cent per email, so 80,000 emails a month is roughly ten dollars. The cost is the setup and monitoring, not the sending.
Will my open rates drop after migrating?
They can dip during warm-up. Authenticate your domain, ramp volume gradually starting with engaged subscribers, and process bounces automatically, and they recover.
Which model is cheapest at 50,000 subscribers?
A one-time licence or a free uncapped plugin, both plus delivery. Per-site annual pricing is close behind and buys continuous development.
Should a small business bother switching?
Below a couple of thousand subscribers, probably not. The saving is modest and the ongoing responsibility for your own sending reputation is a poor trade for it.
The verdict
The whole comparison turns on one thing: flat pricing versus a curve that bends with your success. At 20,000 subscribers a flat licence and a provider bill differ by several thousand dollars over five years, and the gap widens from there.
For most self-hosted lists: FluentCRM at $103 a year, priced per site with unlimited contacts, and a genuine CRM rather than a newsletter sender.
For very large lists sending frequently: a one-time Mailster licence, whose queueing and bounce handling are built for the volumes that break lighter plugins.
And stay with a provider if email is how you earn. The fee buys managed deliverability, accountable support and somebody else’s emergency when a mailbox provider starts filtering. That is worth real money, and pretending otherwise would make the saving look better than it is.
