Sites using Premium SMTP
Outbound mail relay and spam filtering service.
Get told when a new site ships with Premium SMTP.
Stackdar watches every launch we detect and sends you the ones using Premium SMTP, by email, Slack or webhook. On every plan, from £15 a month.
See how alerts work550 sites
546 found by StackScope, 4 via launch platforms
- StackScope Wider Web 500
- StackScope Discovery (Indie) 46
- Product Hunt 2
- Hacker News 1
- PeerPush 1
Premium SMTP has been detected on 550 launches we've crawled, with 59 of those in September 2026 (0.0% of the month's launches so far). The 7-day rolling share is 0.0%, roughly steady week on week. Most recent detection: DiarraDevis | 1er Générateur de Devis Intelligent pour Artisans en Afrique, today.
It's most commonly paired with WP Fastest Cache, HTTP/3, and Google Fonts. By product type, the launches using it are most often Finance (20%), Education (11%), and Health (11%). By domain ending, launches using it are 4.2 times as likely as the average launch to live on a .org domain.
What kind of products ship with Premium SMTP
115 launches
Domain endings using Premium SMTP
547 sites
- .com 71.85%
- .org 8.41%
- .net 6.03%
- .site 3.47%
- .online 3.29%
- .ch 1.10%
- .fr 1.10%
- .store 1.10%
- .tech 1.10%
- .app 0.73%
- .ma 0.37%
- .agency 0.18%
Country
11 of 550 sites, where we are semi-confident of the country.
-
France
45.45%
-
Switzerland
36.36%
-
Algeria
9.09%
-
Morocco
9.09%
Share of new sites using Premium SMTP
Each dot is one launch day. Line is the 7-day rolling average; weekly averages before June 2026.
The shaded part of the chart is measured against a different set of sites. Until 8 July 2026 we only tracked launches from launch platforms; from that date we crawl the wider web as well. The share is a proportion of whatever we were tracking at the time, so it can step at that line without the technology itself changing. For a single continuous measure, switch to launch platforms.
How StackScope detects technologies
⋮ Jul 3, 2026: Email provider detection improved: providers identified from mail configuration are now caught on a site's first crawl. Earlier data may slightly undercount.
Email Security leaders
| Tool | % of launches | % of category | ||
|---|---|---|---|---|
| #1 | – |
DNSSmartHost
|
0.27% | 55.41% |
| #2 | – |
MailSpamProtection
|
0.26% | 54.06% |
| #3 | – |
AntiSpamCloud
|
0.09% | 19.61% |
| #4 | ▲2 | Premium SMTP Current page | 0.02% | 4.14% |
| #5 | ▼1 | SpamExperts | 0.02% | 3.17% |
Percentages show adoption among indie launches: the share of all analysed launches, and of launches using any Email Security tool.Among August launches it ranked #4 in Email Security, up from #6 in July. All 148 in Email Security →
Often used with
| Tool | Sites |
|---|---|
| WP Fastest Cache | 494 |
| HTTP/3 | 417 |
Google Fonts
|
317 |
jQuery
|
195 |
Tailwind CSS
|
159 |
Tools most often detected on the same sites as Premium SMTP.
Recent launches we can show
50 of the 550 sites using Premium SMTP are product launches we list individually. The other 500 are sites we found crawling the wider web: they count towards the figures above, but we do not publish them one by one. How StackScope Discovery works
OVERA 360 | Gestion du patrimoine, GMAO & Facility Management
ACTEURS+ | La Maison des Talents du Cinéma Africain
Shootmenu — Menu digital QR Code pour restaurants | Gratuit
Marketing
kaivelt — Decision Intelligence pour le marché du café
MonClub Pro — Le logiciel de gestion qui propulse vos académies sportives
Knoora — Créez des assistants IA à partir de vos connaissances
Mashujaa-Connect | Santé Reproductive en RDC
Health
Accueil — La marketplace d'expertise en Guinée
ReparoLink – La réparation simple et fiable
Gérez votre boutique depuis votre téléphone — E-boutiks
FreeProConverter — Convert Files Online for Free
Showing the most recent 12 of 50.
The StackScope API serves all 550 sites using Premium SMTP, filterable and exportable, from £15 a month.