Sendloop Review 2026: 110,000 Users in 2018, 36,000 Today

The short version

Sendloop is the quietest platform we have reviewed. Its last blog post is dated 26 May 2023. Its most recent customer review anywhere is dated 10 December 2018. Its help portal has died twice, in two different technologies. Its developer forum has zero topics. Its GitHub organisation returns a 404.

And yet it is not dead. The login page loads. Billing plans render with real prices. The publisher, Octeth, ships a release of its other product roughly every two weeks, including one dated 14 August 2026 and another scheduled for 28 August 2026. Sendloop appears nowhere in that changelog.

The single most telling fact is on Sendloop’s own About page, where two customer counts sit a few paragraphs apart. One says “As of November 2018, it has 110,000+ users from 100+ countries.” The other says “we provide an email delivery platform to more than 36,000 customers in more than 100 countries at the moment.” The homepage puts a finer point on it: “Servicing 36,279 aspiring businesses across 119+ countries”.

The vocabulary shifts from users to customers, so the two numbers are not strictly comparable. Even allowing for that, a page that advertises its 2018 peak next to a present-day figure two thirds lower is telling you something the marketing copy does not intend to.

The dates, which are the whole story

We collected every date we could find and verified each one on a second literal read of the same page. Ordered newest first:

Read that table twice. The publisher shipped software eleven days ago. The product being reviewed here has not been written about by its own vendor in thirty-nine months, and has not been reviewed by a customer in ninety-two.

110,000 users, then 36,279 businesses

This deserves its own section because it is the only place on this site where a vendor publishes its own decline.

Both counts are on the live site today, on the same page, and we confirmed both on a second literal read. We did not need an archive snapshot to establish the earlier figure, because the vendor still advertises it.

The last line is the one that does not fit. Forty new customers a day is about 14,600 a year. A business acquiring 14,600 customers annually and holding 36,279 in total is either losing them at a comparable rate or the number is decorative. Both readings are worth knowing before you migrate a list.

Two companies that do not mention each other

None of this is evidence of anything improper. Small companies restructure and forget to update a footer. It is evidence that nobody has read these pages side by side in a while, which is the recurring theme of this review.

The asymmetry that matters

Octeth is not a dormant publisher. Its self-hosted product, Oempro, ships on a fortnightly cadence with a published release history: v5.9.4 released 14 August 2026, v5.9.5 scheduled for 28 August 2026. That is a healthy release rhythm by any measure.

The word Sendloop does not appear anywhere in that changelog. We checked. Whatever engineering attention the publisher has, the hosted product is not receiving it.

Pricing, and the line that stops you

A cent per email is roughly ten times the going rate. Brevo, EmailOctopus and MailerLite all send far cheaper than that at any volume. The free plan is therefore not a free plan in the sense every competitor uses the phrase; it is a storage tier with metered sending at a punitive rate.

The paid plans are a different matter. $39 a month for 45,000 stored subscribers is genuinely competitive, and $235 for half a million with a dedicated IP and delivery consultancy included is cheap for what it is. This is the one part of Sendloop that argues for itself.

Third-party listings show a starting price of $9 per month. That figure is not on Sendloop’s pricing page today and we do not repeat it.

SMTP, which is not documented at all

This is a site about SMTP, so we looked hard. On the features page, the strings SMTP, port and relay are all absent. We also checked the homepage, the pricing page, the products page, the integrations page, the help portal link, the Notion documentation, help.sendloop.com, the developer forum and the authentication guide.

No hostname, no port, no encryption mode and no authentication method is published anywhere.

What the DNS guide does contain

The most recent blog post, from 26 May 2023, is a domain authentication guide. It publishes real values, and they are the closest thing to technical documentation Sendloop currently has:

• SPF record: “v=spf1 a mx include:sendloop-1.com include:spf.qpostie.com ~all”
• DKIM selector: “sl._domainkey”
• Tracking domain of the form c1f5903-4cead6.tracker.sndlp.com

These are sender authentication records, not relay settings. DMARC is not mentioned at all, which in 2026, after the bulk sender requirements introduced by the major mailbox providers, is a significant omission in a guide whose entire subject is domain authentication.

A full featured API with nothing behind it

The features page carries the bullet “Full Featured API”. It is a list item with no sentence before or after it and no link attached.

On that same page, the strings endpoint, base URL, API key and authentication are all absent. There is no base URL published, no authentication scheme, no endpoint reference, no SDK in any language, and no Postman collection. github.com/sendloop returns 404.

MCP

Sendloop publishes no MCP server. A third-party one exists, hosted by Composio and described as a hosted Sendloop MCP for Claude, Cursor and ChatGPT, wrapping the same five read-only actions. We record it because it is real and usable, and we do not credit it to the vendor, because the vendor did not build it and does not mention it.

Support, and two dead help portals

Sendloop’s help documentation has failed twice, in two different generations, and both failures are still linked from the live site.

To be fair to the product: the reviews that exist are warm about support, and the High Volume plan includes one-to-one email delivery consultancy, which is a real offer. But the newest of those reviews is from 2018, and the self-service documentation a new customer would reach for on day one is gone.

Eleven reviews, the newest from 2018

Capterra shows 4.5 from 11 reviews. We read all eleven. G2 shows 4.4 from 23 and renders none of them behind a prompt to log in, so we read zero and quote nothing from G2. GetApp carries the same corpus as Capterra and is not additive. Trustpilot returns 404. SourceForge lists the product with no reviews.

The star distribution we counted across the eleven rows is six at five stars, four at four stars and one at three. That is identical to the distribution GetApp publishes independently, which is a useful cross-check that our read of the corpus is complete and correct.

What the eleven reviewers actually liked, before the corpus stopped: the price, the simplicity of list management, the template editor, and support that answered. What they raised: interface dated even then, limited reporting, and integration gaps. Nothing in the corpus is damning. It is simply nine years old, and it describes a product that has since had thirty-nine months without a blog post.

Deliverability, with no figure of any kind

Sendloop is absent from the EmailToolTester seedlist panel, which tested fifteen platforms in January 2024 and has since been discontinued in favour of feature assessments. It has no page on emaildeliverabilityreport.com. The vendor publishes no delivery rate, no inbox placement figure and no service level agreement.

There is no measurement of Sendloop deliverability, from the vendor or from anyone else. What exists in its favour: a dedicated IP option on the High Volume plan, one-to-one delivery consultancy on that same plan, a documented SPF and DKIM setup, and a separate tracking domain. What counts against: no DMARC guidance in a domain authentication guide written in 2023, and no relay documentation at all.

What is still advertised

Nineteen features are listed on the site: drag and drop editing, “100+ email templates for free”, RSS to email, autoresponders, segmentation, list management, webhooks, and a “Managed Delivery Service”. The application loads and logs in, so this is a live service and not a parked domain.

The integrations claim is “Connect Sendloop to 1,000+ third party services.” Twenty-five are actually named on the page. The rest of that number rests entirely on Zapier, which is a legitimate way to reach a thousand integrations and a misleading way to count them. No rate limits or sending quotas are published for any plan.

Ratings breakdown

Ease of use, 5.5. The eleven reviewers who wrote anything were consistently positive about simplicity, and the editor and list management were the two things they named. Held down because the interface they were describing is a 2018 interface, and every piece of self-service documentation that would help a new user has gone offline.

Automation, 4.0. Autoresponders, segmentation, RSS to email and webhooks are all advertised and the application runs. There is no evidence of anything added since 2023, and no changelog to check.

Deliverability, 4.0. A dedicated IP and delivery consultancy on the top plan are real assets, and the SPF and DKIM setup is properly documented. Against that: no measurement of any kind from anyone, no DMARC guidance, and no relay documentation.

Support, 3.5. Two dead help portals still linked from the live site, a feedback forum with zero topics, no telephone number, no address, and email as the only channel. The historical praise is real and it is eight years old.

Pricing value, 4.5. $39 for 45,000 subscribers is one of the better prices in this category and pulls this score up on its own. Pulled back down by a free tier whose feature list includes the absence of email delivery, and by metered sending at roughly ten times the market rate.

API and MCP, 3.0. A full featured API is announced as a bullet point with no endpoint, no base URL, no authentication scheme, no SDK and no repository. We know the API exists only because a third party integrated with it. There is no vendor MCP server.

Who should use Sendloop, and who should not

Third-party validation

Where this review says something is named by reviewers, it means named in that many of the eleven rendered Capterra rows. We never add Capterra and G2 into a single denominator, and we do not add GetApp at all because it is the same corpus twice.

Top 3 alternatives

Continue reading

• Sendloop pricing, the three plans and the metered free tier
• Sendloop API, what is announced and what is published
• Sendloop integrations
• EmailOctopus review
• MailerLite review
• Brevo review

Frequently asked questions

Is Sendloop still active in 2026?

The service is running: the login page loads, billing plans render with current prices, and the copyright year is 2026. Development is a different question. The last blog post is dated 26 May 2023, the company timeline stops at 2017, there is no changelog or status page, and the word Sendloop does not appear anywhere in the release notes of Octeth’s other product, which ships every fortnight.

How much does Sendloop cost?

Three plans. Free at $0 stores unlimited subscribers but its feature list states no email delivery, with sending charged at $0.01 per email. Pro is $39 a month for up to 45,000 stored subscribers. High Volume is $235 a month for up to 500,000, including a dedicated IP address and one-to-one email delivery consultancy. A $9 starting price appears on some third-party listings and is not on Sendloop’s pricing page.

What are Sendloop’s SMTP settings?

There are none published. We searched the features page, the homepage, the pricing page, the products page, the integrations page, the documentation and the support site, and found no hostname, no port, no encryption mode and no authentication method. Be careful with DNS lookups here: Sendloop runs a wildcard record, so smtp.sendloop.com resolves, and so does any invented subdomain. What is documented is domain authentication, with an SPF include of sendloop-1.com and spf.qpostie.com and a DKIM selector of sl._domainkey.

Does Sendloop have an API?

Yes, but it is not documented. The features page lists Full Featured API as a bullet point with no link, and no base URL, authentication scheme, endpoint reference or SDK is published anywhere. github.com/sendloop returns 404. We know the API is real because Composio integrates with it and exposes five read-only actions using an API key or OAuth2, which means somebody has access to a reference the public does not.

Who owns Sendloop?

Sendloop’s footer names Octeth, Inc., with a copyright running from 1999. Octeth’s own site names 50SAAS, LLC. Neither company is mentioned on the other’s website and no page reconciles the two. No registration number, registered office or country of incorporation is published for Sendloop, and its only contact channels are an email address and a web form.

Is Sendloop a good alternative to Mailchimp?

On price for large stored lists, yes. On everything a 2026 buyer checks after price, no. Mailchimp publishes SMTP settings, a full API reference, a status page and a changelog, and has a measured inbox placement figure of 89.5 percent from the January 2024 seedlist round. Sendloop publishes none of those things and has not been reviewed by a customer since December 2018.

Changelog