Bottom line: SendFox is an email marketing tool for creators, built by AppSumo’s own company, Sumo Group. On AppSumo it sells one plan: $29 once for 5,000 contacts and 300,000 lifetime email sends. The word that matters is “lifetime.” Those 300,000 sends are one pool that never refreshes, and when it’s gone, sending pauses until you add a monthly Pro plan, which starts at $19 a month on SendFox’s own site. That’s still a cheap way to run a small newsletter for years. It isn’t unlimited email, and SendFox has already changed the rules once for older lifetime buyers. The listing shows no “We Got Your Back” line either way, but it is “Refundable up to 60 days.”
Best for: bloggers, podcasters and authors with a list under 5,000 who send a newsletter once or twice a month.
Think twice if: you mail a large list every week, need SMTP access, or need to remove SendFox’s footer.
We have no affiliate deal with SendFox or AppSumo; links go to the official pages. How we review.
Updated 29 October 2026. This SendFox review rests on what we read that day: the SendFox listing on AppSumo, including the plan card, the deal terms, the founder posts, FAQs, questions and reviews, SendFox’s own pricing page, and two SendFox help articles on the $29 send pool and paused accounts. We haven’t sent campaigns with it, so we describe the plans, the limits and what buyers report, not deliverability.
SendFox review at a glance
| What we checked | What the pages say |
|---|---|
| Made by | AppSumo; “An AppSumo Original,” © Sumo Group, Inc. on sendfox.com |
| AppSumo plan | License Tier 1, $29 once (listing shows “$480” struck through) |
| Contacts | 5,000 |
| Sends | 300,000 lifetime, a pool that never refreshes |
| Free plan on sendfox.com | 1,000 contacts, 3,000 sends a month |
| Pro on sendfox.com | From $19 a month for 5,000 contacts and 100,000 sends a month |
| Refund | Refundable up to 60 days on AppSumo |
| AppSumo guarantee line | None shown on the listing |
| Listing rating | 4.02 stars from 341 reviews, 28,787 bought |
Who makes SendFox
Most AppSumo products come from outside companies. SendFox doesn’t. The listing says it was “Created and developed by AppSumo for entrepreneurs everywhere,” the deal terms call it “An AppSumo Original,” and the footer of sendfox.com reads “© 2026 Sumo Group, Inc.” The listing groups it with TidyCal, BreezeDoc and FormRobin as “Part of the Sumo family.” The company details give September 2018 as the founding date, Texas as the location and a team of 1-10.
If you’ve bought TidyCal or BreezeDoc, you’ll recognise the arrangement: the seller and the maker are the same business. That’s usually reassuring with a lifetime deal, because the company that took your money is the one running the servers. It cuts both ways, though, as the section on older buyers below shows: being an AppSumo product didn’t stop SendFox from putting new limits on lifetime accounts it had already sold.
What SendFox does
SendFox covers the basics a newsletter writer needs, and a bit more. The listing describes:
- Writing: a block-based editor with images, buttons, columns and dividers, saved templates and reusable sections, and a button that suggests five subject line and preview-text pairs from your draft.
- Automations: multi-step welcome, onboarding or launch sequences, A/B tests inside an automation, and RSS-to-email “Smart Campaigns” that turn new blog or podcast posts into newsletters.
- Reporting: a health score, trends over time, a per-email report and a full activity timeline for each contact.
- List building: landing pages called Smart Pages, forms, popups and sticky bars, and a referral widget.
- Connections: a full API and Zapier, plus KingSumo and Sumo.com.
Noah Kagan’s update on the listing, dated 20 October 2026, adds tag-based automations with yes/no branches, contact tags, an AI email writer that drafts from a link or idea, team logins, per-list unsubscribes and a Kit importer. A June 2026 post from General Manager David Kelly says SendFox shipped “147 new features, improvements, and updates” in the previous six months.
The send pool: what most people miss
Here’s the line to read twice. SendFox’s help article says the $29 plan’s “300,000 emails are a cumulative, one-time pool — not a monthly allowance.” Newsletters, automation emails and transactional emails from your app all draw from it, and “it never refreshes.”
When the pool runs out, sending stops. Scheduled emails go back to drafts. Automation emails wait, and any still waiting 60 days later are dropped. A newsletter that’s bigger than what’s left “stops once the pool is used up,” so part of your list gets it and part doesn’t. SendFox warns you at 90% and 100%. To keep sending, you add Pro.
Most people miss the transactional part. If your app sends receipts, password resets or login codes through SendFox’s email API, each one quietly spends a send from that same finite budget, right alongside your newsletter.
You also can’t top it up with a second code. The help article says “Only one $29 Lifetime deal can be active per account,” and the deal terms say “No codes, no stacking.”
One reviewer put it bluntly in September 2026: “So, lifetime until it’s not.” That’s fair as a warning, though honestly, for a small list the pool lasts a long time. The sums below show how long.
Worked examples: how long 300,000 sends lasts
Every number here comes from the plan limits; the sending habits are examples, not data.
A new blog, 1,000 subscribers, one newsletter a week. That’s about 52,000 sends a year. The pool lasts close to five years and nine months, before welcome emails. Turns out this writer would outgrow SendFox’s Free plan, which allows 3,000 sends a month, because four weekly issues to 1,000 people is already 4,000.
A podcast, 2,500 subscribers, weekly. About 130,000 sends a year, so the pool lasts roughly two years and four months. Add a five-email welcome sequence for 100 new subscribers a month and you burn another 6,000 a year.
A full list, 5,000 subscribers, weekly. That’s 260,000 sends a year. The pool is gone in under 14 months. After that you’d pay at least $19 a month for Pro, so the lifetime plan saves you about a year of Pro and no more.
A small list, twice a month. 1,000 subscribers and two issues a month is 2,000 sends, inside the Free plan’s 3,000. If you’ve got a list this size and don’t mind the branding, skip the purchase for now and start on Free.
Don’t forget the welcome sequence. When you add 50 newcomers a month to a five-email series, that’s 3,000 sends a year before a single regular issue goes out.
In practice, multiply your list size by your issues per year, add your sequences, and divide 300,000 by the total. That’s your rough number of years.
The plan, and SendFox’s own prices
The AppSumo plan card for License Tier 1, read on 29 October 2026:
- $29, “Lifetime access”
- Lifetime email sends: 300,000
- Contacts: 5,000
- Scheduled & smart campaigns
- Unlimited forms, contact lists, landing pages and triggered automations
- Referral widget
- CRM contact view
- API & AI-agent access
- Translation in 30+ languages
- Email support
The listing shows “$480” struck through and “-94%.” That’s the listing’s comparison; we didn’t find a $480 price anywhere on sendfox.com. Skip the struck-through figure; the useful yardstick is Pro 1 at $19 a month.
| Plan | Price |
|---|---|
| License Tier 1 Small lists sending weekly or less |
$29 once |
One-time price on AppSumo, one plan per account, no stacking. SendFox's own site lists Free ($0, 1,000 contacts, 3,000 sends a month) and Pro monthly: $19 (5K contacts, 100K sends a month), $39 (15K, 200K), $79 (50K, 400K), $149 (100K, 800K), $399 (250K, 2M), or 10x monthly per year.
Prices checked Oct 29, 2026 on SendFox’s own pricing page. Lifetime deals are listings that can end or change, so check the live listing before you buy.
SendFox’s own pricing page sells three things. Free is $0 with 1,000 contacts, 3,000 sends a month, one Smart Page, one form, one automation and SendFox branding. Lifetime is the same $29 plan, with a “Get it on AppSumo” button. Pro is monthly, priced by list size:
| SendFox Pro tier | Monthly | Annual | Contacts | Sends a month |
|---|---|---|---|---|
| Pro 1 | $19 | $190 | 5,000 | 100,000 |
| Pro 2 | $39 | $390 | 15,000 | 200,000 |
| Pro 3 | $79 | $790 | 50,000 | 400,000 |
| Pro 4 | $149 | $1,490 | 100,000 | 800,000 |
| Pro 5 | $399 | $3,990 | 250,000 | 2 million |
Pro adds white labelling (“No SendFox anywhere”), paid newsletters through Stripe, a full HTML editor and sends that refresh every month. Lifetime keeps a “Small SendFox footer.” So the AppSumo deal is the only way to buy the lifetime plan, and it costs about a month and a half of Pro 1.
Where the pages disagree
We found four places where SendFox’s pages say different things. Most people miss these, and each one matters for a specific buyer.
AI assistant (MCP) access. The pricing page lists “MCP access” on Lifetime, and the plan card says “API & AI-agent access.” But on 12 October 2026 SendFox’s team (Luka_originals) answered a buyer: “The MCP server is available on the Pro plan. Lifetime plans don’t include it, but they do include the REST API.” If you’re buying to connect Claude or ChatGPT, ask first.
Double opt-in. The AppSumo FAQ says “All Lifetime accounts require double opt-in by default,” and only the monthly plan can turn it off. The pricing page says Lifetime gets “Single opt-in after a one-time domain setup.” An August 2026 reviewer complained about forced double opt-in, so it has been the case recently.
Custom domains for landing pages. The listing’s overview says “Host branded landing pages on your own custom domain.” The AppSumo FAQ, answering the same question, says “Not currently.”
Tiers and the Empire Add-On. The deal terms mention “Ability to upgrade or downgrade between 5 license tiers,” but the listing shows only Tier 1, and the help article says it’s one per account. The terms also offer “Remove branding and access bonus features for $10 per month with Empire Add-On,” while SendFox’s help centre calls Empire “the previous name of SendFox’s monthly plan” and the pricing page starts Pro at $19. Treat $10 as unconfirmed.
Honestly, none of these four is a dealbreaker by itself. Together they suggest the AppSumo page hasn’t caught up with a product that’s changed fast this year, so trust a dated written reply over any bullet point.
Older lifetime buyers: why the history matters
SendFox has sold lifetime deals on AppSumo for years. Its help article on paused accounts says “The older AppSumo lifetime deals were sold with uncapped sending,” and “That is no longer the case.” Older lifetime accounts that send past what their purchase covers, and more than 3,000 emails in 30 days, now get 30 days to pick a Pro plan, and then sending pauses. While paused, Smart Pages and hosted forms show a “not found” page.
To its credit, SendFox says the purchase isn’t revoked, data stays exportable, and light senders under 3,000 a month are never paused. And on 20 October 2026 its team confirmed on AppSumo that “the 300,000 send pool doesn’t apply to lifetime plans bought before it was introduced in June 2026.”
Don’t forget what this tells you as a new buyer. A “lifetime” email plan from the marketplace’s own company was changed after the fact for heavy senders. The new $29 plan at least writes its limit down. We’d expect the 300,000 figure to hold, but no page promises it can’t change.
What buyers report
The listing shows 4.02 stars from 341 reviews: 202 five-taco ratings, 38 four, 44 three, 19 two and 38 one. That’s a wider spread than most deals we’ve read.
Easy, basic, cheap. An August 2026 reviewer called it “a very affordable and easy to use platform,” but listed no text wrapping in the editor, forced double opt-in, and that unsubscribed contacts “cannot resubscribe later.” Noah Kagan replied two days later.
Hard to reach. An August 2026 review titled “Needs tech support” said there was “no way to get ahold of the company.” SendFox’s team replied in late September with support@sendfox.com.
An editor change, then a fix. A June 2026 review from a non-profit booster club said a new interface broke their custom HTML. Four days later they updated it: support restored HTML editing, and they changed to five tacos. If you’ve relied on hand-coded HTML templates elsewhere, rebuild one in your first week.
No SMTP. SendFox’s FAQ says it doesn’t provide SMTP access and uses domain validation instead. If you’ve been hoping to send through FluentCRM or another tool, it won’t work.
The terms
The deal terms read:
- “Lifetime access to SendFox.”
- “All future Lifetime Plan updates.”
- “An AppSumo Original, created by the AppSumo team as a simple, affordable solution.”
- “No codes, no stacking—just choose the plan that’s right for you.”
- “You must activate your license within 60 days of purchase.”
- “Ability to upgrade or downgrade between 5 license tiers.”
- “GDPR compliant.”
- “Remove branding and access bonus features for $10 per month with Empire Add-On.”
The listing shows “Refundable up to 60 days.” We found no “We Got Your Back” line, covered or not covered, on this listing.
SendFox vs Kit, Mailchimp and MailerLite
The listing names ConvertKit (now Kit), Mailchimp and MailerLite as alternatives, and SendFox’s pricing page prints its own price comparison against Kit, beehiiv and Mailchimp. We didn’t price any of them for this review, so we won’t repeat those figures. What we can say from SendFox’s pages: it’s built for creators on a budget, it has no SMTP access, it keeps a footer on Lifetime, and its lifetime plan is a fixed send pool. If you need advanced segmentation, e-commerce sync (the FAQ says there’s no Shopify integration yet) or sending through another app, check those tools’ own pages.
Common mistakes with the SendFox deal
Reading “lifetime” as unlimited sending. It’s 300,000 sends, once. Do the sum for your list.
Buying two codes for more sends. You can’t. One $29 plan per account.
Buying for MCP alone. SendFox’s own team says Lifetime doesn’t include the MCP server. Ask before you buy.
Expecting to remove the footer. The footer stays on Lifetime; white labelling is Pro.
Planning on SMTP. There isn’t any.
Skipping the Free plan. When you send to a small list twice a month, Free may cover you.
Who SendFox suits
A new blogger or podcaster. A list under 5,000 and a newsletter every week or two: the pool lasts years.
An author with two pen names. SendFox’s team says one account can verify two domains and run separate lists and sequences, sharing the contact limit and pool.
A creator who wants RSS-to-email. Smart Campaigns send new posts automatically.
A hobbyist with a tiny, quiet list. Skip the purchase and start on Free; you can buy the lifetime plan later while the listing is live.
Anyone mailing 5,000 people weekly, or doing cold outreach or affiliate blasts. Skip it; a May 2022 post on the listing says SendFox “isn’t right for you” for those.
How to test it inside the refund window
- Import your real list and check how many contacts count against the 5,000.
- Do the send sum: contacts × issues a year, and compare with 300,000.
- Set up domain validation and check whether single opt-in is offered.
- Rebuild your best newsletter in the editor, including any custom HTML.
- Email support@sendfox.com with your MCP and tier questions, and keep the answer.
What we couldn’t check
We didn’t send email, measure deliverability or test the AI writer. We couldn’t settle whether Lifetime includes MCP, single opt-in or custom domains for Smart Pages, because SendFox’s own pages disagree. We couldn’t confirm the “5 license tiers” or the $10 Empire Add-On, or find the source of the $480 struck-through price. Get written answers before day 60.
FAQ: SendFox questions
Is SendFox a one-time payment on AppSumo?
Yes. License Tier 1 is $29 once for 5,000 contacts and 300,000 lifetime sends, refundable up to 60 days.
Does the SendFox lifetime plan include unlimited emails?
No. It includes a one-time pool of 300,000 sends that never refreshes. After that, sending pauses until you add Pro.
Who makes SendFox?
AppSumo. The listing calls it “An AppSumo Original,” and sendfox.com is © Sumo Group, Inc.
Is there a free SendFox plan?
Yes. SendFox’s pricing page lists Free with 1,000 contacts and 3,000 sends a month, with SendFox branding.
The verdict
SendFox is a simple, cheap way for a small creator to run a newsletter, from AppSumo’s own company, with a 60-day refund. The $29 plan is honest about its limit once you find the help page: 300,000 sends, ever. For a list of 1,000 to 2,500 sending weekly, that’s years of email. For a full 5,000-contact list, it’s about a year. The disagreements between its pages, and the rules it changed for older lifetime buyers, keep the score down. If you’ve got a modest list, honestly, it’s an inexpensive experiment. Do the send sum, ask your questions in writing, and decide before day 60.
SendFox on our desks
Our YouTube channels cover SendFox from different angles. Each video opens on YouTube.
