Selzy Review 2026: A 4.8 Rating Built in Three Months
The Best: Fastest onboarding of any platform reviewed here
The Worst: A 4.8 Capterra score built on a three-month review burst
The short version
Selzy has the second-highest Capterra rating on this site, 4.8 across 116 reviews, and we do not think you should trust it.
We read all 116. A clear majority come from a single burst between August and November 2023, overwhelmingly from people with Indian IT job titles, Software Engineer, Associate Software Engineer, Cloud Engineer, Technical Specialist, Functional Tester, almost all rating five stars, and with cons fields that are empty or say nothing: “Everything is good”, “no small drop of problem”, “It is affordable and cheap to access therefore service time and promotes businesses”. That is the shape of a review campaign, not of a product being used and reported on over time.
Read the reviews that fall outside that window and a different, more useful product appears. Genuine users describe a clean interface, warm support and a real free tier, and they also describe a specific recurring problem: “I have had problems with emails going to spam/junk. This occurred even on emails that had low spam scores when I tested online.” Six separate reviewers raise deliverability, which is a lot in a corpus this flattering.
Two structural facts matter for a site about SMTP. Selzy itself has no relay: transactional email runs through an API trigger inside a scenario. The relay is UniOne, a sibling product from the same Cypriot publisher, and even UniOne does not publish its SMTP ports anywhere we could find.
A capable, cheap, genuinely easy tool for a small European or CIS-facing sender, with a rating you should discount and a deliverability record you should test yourself. If you need a relay, look at UniOne directly, and expect to ask support for the port.
Why we are discounting the rating
The distribution is not spread across years. A large block falls in a single three-month window in late 2023, and within it the reviewers share a job-title family, a country of origin, a star rating and a style of cons field that says nothing. Individually, none of that proves anything. Together, in one quarter, it is the classic signature of an incentivised campaign.
We are not accusing anyone of fraud, and we are not discarding those reviews. We are telling you that Selzy’s 4.8 is not comparable to Customer.io’s 4.7 or SMTP2GO’s 4.9, because those averages were built differently. When we quote from this corpus below, we quote from outside the burst.
This is the third corpus integrity problem we have found in this project, and each took a different form: SparkPost’s listing contains reviews of an unrelated graphic design app; iContact’s 2023 to 2024 block repeats the same phrases across different reviewers; Selzy’s is a dated burst. Capterra averages are useful and they are not evidence on their own.
Snapshot
| Publisher | ECOMZ HOLDING LIMITED, registration 309897, VAT CY 10309897M, at Gladstonos 12-14, 8046 Paphos, Cyprus. Confirmed on both Selzy’s terms page and UniOne’s about page. |
|---|---|
| US licensee | UNITHING CORP., a Delaware corporation |
| Sibling product | UniOne, the SMTP relay. UniOne’s about page: “Our second product, an all-in-one ESP with an ultimately user-friendly interface, Selzy, is additional proof of this concept.” |
| Founding year | Not published. The word “founded” does not appear on Selzy’s about page. |
| Free plan | “Send 1,000 emails to 100 unique contacts within a month free of charge”, no card required |
| Trial | “Start your 14-day Trial and send up to 10,000 emails to 2,000 contacts” |
| Lite and Standard | Billed per unique contact with unlimited emails. Prices not published: the page renders them dynamically and the served HTML shows $0. |
| Prepaid credits | Email packages by month or year, save 15 percent, with a reference rate of $0.005 per email |
| Transactional | $0.001 per transaction. 1,000 for $1 per 30 days, 2,000 for $2, 5,000 for $4, 10,000 for $8. |
| Dedicated IP | $20 connection cost plus $40 monthly |
| Selzy API limits | Published: 1,200 requests per 60 seconds per key or IP; checkEmail and subscribe 300 per 60 seconds; createCampaign 100 per 60 seconds; sendSms 150 numbers per call |
| UniOne SMTP | Hostname smtp.us1.unione.io, found only in a blog post rather than a technical reference. Ports are not published anywhere. |
| UniOne throughput | “SMTP is easy to integrate and allows sending up to 5000 emails per hour using a single connection (ten maximum permitted connections).” |
| UniOne API | Base https://api.unione.io/en/transactional/api/v1, with eu1 and us1 regional hosts. Header X-API-KEY. Requests up to 10 MB, maximum 500 recipients per send. |
| Official MCP | None for Selzy or UniOne. No community server either. |
First: a widely repeated “$7 a month” entry price. Our first read of Selzy’s homepage returned it. A second read, asking only for literal text, found no dollar sign on the page at all. It is either rendered by JavaScript or was invented by the extraction layer, and we have already caught that happening twice on this project. Not published here.
Second: UniOne’s SMTP ports. We searched its SMTP documentation specifically for “port”, “25”, “465”, “587” and “2525”. All absent. We have the hostname and no port, so we publish the hostname and no port. Do not assume 587.
What Selzy does well
Transactional email at a tenth of a cent
$0.001 per transaction, sold in blocks: a thousand for a dollar, ten thousand for eight. That works out at $1.00 per thousand at the smallest block and $0.80 at the largest, which sits between Resend’s $0.90 and Mailgun’s $1.10 to $1.80, from a vendor most people have never heard of. For low-volume transactional needs attached to a marketing account, it is competitively priced.
API rate limits published to the request
Selzy publishes a general limit of 1,200 requests per 60 seconds per API key or IP address, with tighter per-endpoint limits: 300 per 60 seconds on email checking and subscription, 100 per 60 seconds on campaign creation. UniOne publishes a 10 MB request ceiling and a 500-recipient maximum per send.
SendGrid publishes no numbers. Mailgun publishes no numbers. SparkPost calls its limits dynamic. A platform this small doing better than three of the biggest is worth noting.
Genuinely easy, and the honest reviews agree
The homepage promise is “Launch your first email campaign in 15 minutes” and reviewers from outside the 2023 burst back it up. A 2026 reviewer: “The interface is clean and easy to navigate, which made onboarding fast even without spending time on tutorials.” Another: “It’s easy to use. And it’s bringing money.”
Support that answers, including on the free plan
The warmest praise in the corpus is about people. A 2026 reviewer running a gambling operation, a vertical most providers refuse: “The support team is responsive, patient, and helpful no matter how small the inquiry.” A Spanish-speaking reviewer on onboarding: “Hay gente disponible las 24hs y te explican todo con mucha paciencia y claridad.” And one specifically notes “24/7 support even when on free plan”.
A relay in the family, if you know to look for it
UniOne, from the same publisher, describes itself as “a fast, secure SMTP relay provider built for high-volume, time-sensitive messages” offering SMTP and REST API with regional endpoints in the EU and US. If you need both marketing and a relay, one company sells you both, which is a shape only Brevo otherwise offers in this comparison.
Where Selzy falls short
Six reviewers report mail going to spam
In a corpus this flattering, complaints that survive are worth more than usual. Six separate reviewers raise deliverability, and they are specific:
“I have had problems with emails going to spam/junk. This occurred even on emails that had low spam scores when I tested online.” “It’s costly and high in cost, also it is less accurate and spam many times.” “Sometimes the trusted sender mails will be treated as spam.” “Delivery could be shaky sometimes.” “When it comes to email deliverability, there is room for improvement.” “No track of mail whether it reaches inbox.”
There is no independent measurement of Selzy anywhere. It has never been in a placement panel, and the panel that ranked providers has been discontinued. So these six reports are the only evidence available, and they point one way.
Interface elements in Russian and Ukrainian, and a history nobody will confirm
At least five reviewers in late 2022 and early 2023 report untranslated interface elements: “Sometimes some templates are shown in Ukranian”, “Pop-ups in Russian, not customizable”, “templates mostly Russian”, “Initially many items in Ukrainian only”, and one noting features unavailable in English initially.
Selzy is widely reported elsewhere to be the international successor to Unisender, a Russian email platform founded in 2008. We could not verify it. Selzy’s own site never mentions Unisender, and Wikipedia’s Unisender article never mentions Selzy. We checked both with strict text searches. The only supporting evidence we could reach is the language artefacts above and a reviewer noting “They’re newer”.
So: the publisher is Cypriot, the product’s early interface carried Russian and Ukrainian strings, and the company does not describe its own origins publicly. That is what we can establish. If corporate provenance matters to your procurement, ask them directly, because the website will not tell you.
The free plan is the smallest in this comparison
A thousand emails a month to a hundred contacts. Set against Kit’s ten thousand subscribers, Brevo’s daily allowance, Elastic Email’s three thousand emails to a thousand contacts, or MailerLite’s twelve thousand, this is a demonstration rather than a usable tier. The 14-day trial at 10,000 emails to 2,000 contacts is the more meaningful free offer.
No prices published for the plans most people would buy
Lite and Standard, the two plans between free and enterprise, render as $0 in the served page because the figures are injected client-side. We could not read a single monthly price for either, and neither could a buyer without starting a signup. That is now five platforms in this project with unreadable pricing pages.
Support is praised and criticised in roughly equal measure
Against the warm reviews above sit these: “Customer support team reply very late”, “The customer support team provides support but they do not respond”, “Long waiting time for customer support”, “customer service is quite low”. The 4.7 service sub-score comes from the same corpus we are discounting, so we weight the split more heavily than the number.
No MCP, no published SMTP port, no SDK list, no webhooks
Four blanks in a row. There is no MCP server for Selzy or for UniOne, official or community. UniOne’s SMTP ports are not published. UniOne’s documentation references an integrations and libraries section without a retrievable SDK list. And no webhook documentation was reachable for either product.
For a marketing user none of this matters. For anyone integrating, it means you will be opening support tickets to learn things that MailerSend prints on a page.
Product gaps reviewers name specifically
Outside the burst, the substantive complaints cluster: no CRM, limited integrations, Zapier unavailable at the time of one review, no autosave, template design inflexible, and two concrete limitations worth knowing, “Cannot disable double opt-in” and “unchangeable unsubscribe copy”. One reviewer describes the segment-to-scenario link breaking workflows when a segment changes.
Ratings breakdown
Six categories, each out of 10, judged against the same evidence rules on every platform we cover. The overall is the unweighted arithmetic mean, rounded to one decimal: 8.0 + 5.5 + 5.5 + 6.5 + 6.5 + 5.5 = 37.5, divided by 6, equals 6.3. Note that we have discounted the Capterra sub-scores throughout for the reason given at the top.
Ease of use, 8.0. The one category where the inflated rating and the honest reviews agree. Clean interface, fast onboarding, no tutorials required.
Automation, 5.5. Scenarios, segments and triggers exist. No CRM, limited integrations, and reviewers name concrete gaps in opt-in and unsubscribe control.
Deliverability, 5.5. No independent measurement of any kind, and six separate reviewers reporting mail in spam. Held above 5.0 by a dedicated IP option and a sibling product built specifically for delivery.
Support, 6.5. Warm and specific praise, including 24/7 coverage on the free plan, against four reviewers describing slowness or non-response. Scored on the split rather than on the 4.7 sub-score.
Pricing value, 6.5. Transactional at $0.001 is genuinely cheap and the prepaid model is flexible. Held down by the smallest free plan in this comparison and by two plan prices that are not published anywhere.
API and MCP, 5.5. Rate limits published precisely, which is more than most of the category manages. Held down by no MCP server, no published SMTP ports, no retrievable SDK list and no webhook documentation.
Who should use Selzy, and who should not
Selzy is the right call for
Look elsewhere if
Third-party validation
| Source | Score | Volume | Notes |
|---|---|---|---|
| Capterra | 4.8 / 5 | 116 reviews | Ease of use 4.7, customer service 4.7. Product ID 255420. Discounted: a majority fall in one three-month burst in late 2023 with near-identical profiles and empty cons fields. |
| G2 | 4.7 / 5 | 33 reviews | A much smaller corpus, profile marked as claimed with limited features. |
| Trustpilot | N/A | – | No verified listing found. |
| Inbox placement | No figure | – | Never included in the seedlist panel, which has since been discontinued. |
Selzy’s badge on its own website shows 4.8 from 114 Capterra reviews; the listing itself showed 116 when we counted. A two-review discrepancy is unremarkable and we note it only because we counted rather than trusting either.
Top 3 alternatives
| Alternative | Our score | Take it instead if |
|---|---|---|
| MailerLite | 7.4 | The same simplicity at a similar price, with a measured 89.8 percent inbox placement, published prices and a review corpus we did not have to discount. |
| EmailOctopus | 7.1 | You want the cheapest credible paid tier in the category and the best-loved sub-scores on Capterra at 4.7 and 4.8, earned steadily rather than in a burst. |
| Brevo | 7.7 | You want marketing and a documented SMTP relay from one vendor, billed on sends. The shape Selzy and UniOne approximate, done properly. |
Continue reading
- Selzy pricing, the free tier, prepaid credits and transactional rates
- Selzy API, published rate limits and the UniOne endpoints
- Selzy integrations
- MailerLite review
- EmailOctopus review
- Brevo review
Frequently asked questions
Is Selzy free?
There is a permanent free plan of 1,000 emails a month to 100 unique contacts, with no credit card required. That is the smallest free tier of any platform we review. There is also a 14-day trial allowing up to 10,000 emails to 2,000 contacts, which is the more useful way to evaluate it.
How much does Selzy cost?
We cannot tell you for the Lite and Standard plans, because Selzy’s pricing page renders them dynamically and the served page shows $0. What is published: prepaid email credits with a reference rate of $0.005 per email and 15 percent off for annual purchase, transactional email at $0.001 per transaction sold in blocks from $1 for a thousand, and a dedicated IP at $20 to connect plus $40 a month. A widely quoted $7 monthly entry price does not appear on the page when read literally, so we do not publish it.
Does Selzy have SMTP?
Not directly. Selzy handles transactional email through an API trigger inside a scenario. The SMTP relay is UniOne, a sibling product from the same Cypriot publisher, which documents a hostname of smtp.us1.unione.io in a blog post and does not publish its ports anywhere we could find. UniOne states that a single SMTP connection allows up to 5,000 emails an hour with ten connections permitted.
Who owns Selzy?
ECOMZ Holding Limited, a Cypriot company registered as number 309897 at Gladstonos 12-14, Paphos, with a Delaware licensee named Unithing Corp. The same publisher owns the SMTP relay UniOne, which describes Selzy as its second product. Selzy’s own about page does not state a founding year and does not name its founders. Selzy is widely reported elsewhere to be the international successor to the Russian platform Unisender; neither company’s own materials say so, and we could not verify it.
Is Selzy’s 4.8 rating reliable?
We read all 116 reviews behind it and would treat it with caution. A clear majority fall in a single three-month window in late 2023, share a narrow job-title and country profile, rate five stars, and have cons fields that are empty or meaningless. Read the reviews outside that window instead: they describe a genuinely easy product with warm support and a recurring spam-placement problem raised by six separate people.
Changelog
| Date | Change |
|---|---|
| 27 August 2026 | First publication. All 116 Capterra reviews read across 5 pages, the complete population, with the late-2023 burst identified and quotations taken only from outside it. Publisher identity confirmed twice across Selzy’s terms page and UniOne’s about page. Transactional rates, API rate limits and free plan limits verified twice. A widely repeated $7 entry price was found absent from the page on a literal second read and is not published. UniOne’s SMTP ports were searched for explicitly and are absent from its documentation. The reported Unisender lineage could not be verified on any official source and is reported as unverified. |
This review follows our email infrastructure testing methodology. We disclose affiliate relationships in our editorial independence policy.
