Sites using AuthSMTP
Get told when a new site ships with AuthSMTP.
Stackdar watches every launch we detect and sends you the ones using AuthSMTP, by email, Slack or webhook. On every plan, from £15 a month.
See how alerts work28 sites
25 found by StackScope, 3 via launch platforms
- StackScope Wider Web 19
- StackScope Discovery (Indie) 6
- Hacker News 2
- Product Hunt 1
AuthSMTP has been detected on 28 launches we've crawled. Most recent detection: 123greetings.com, 2 days ago.
It's most commonly paired with Google Fonts, Cloudflare, and Cloudflare DNS. By product type, the launches using it are most often Developer Tools (31%), Marketing (15%), and AI (8%).
What kind of products ship with AuthSMTP
13 launches
Domain endings using AuthSMTP
28 sites
- .com 57.14%
- .io 14.29%
- .co 7.14%
- .uk 7.14%
- .app 3.57%
- .net 3.57%
- .org 3.57%
- .xyz 3.57%
Share of new sites using AuthSMTP
Each dot is one launch day. Line is the 7-day rolling average; weekly averages before June 2026. Chart starts at first detection.
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 1, 2026: Adoption figures now count launches from launch platforms. Use the source view to include StackScope Discovery.
⋮ 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.
Transactional Email leaders
| Tool | % of launches | % of category | ||
|---|---|---|---|---|
| #1 | – |
Resend
|
5.35% | 62.92% |
| #2 | ▲1 |
SendGrid
|
0.66% | 7.76% |
| #3 | ▼2 |
Amazon SES
|
0.63% | 7.45% |
| #4 | ▲1 |
MailChannels
|
0.52% | 6.09% |
| #5 | – |
Mail.Baby
|
0.44% | 5.22% |
| … | ||||
| #39 | ▲4 | AuthSMTP Current page | <0.01% | 0.01% |
Percentages show adoption among indie launches: the share of all analysed launches, and of launches using any Transactional Email tool.Among August launches it ranked #35 in Transactional Email, up from #39 in July. All 150 in Transactional Email →
Often used with
| Tool | Sites |
|---|---|
Google Fonts
|
18 |
Cloudflare
|
15 |
Cloudflare DNS
|
13 |
| HSTS | 12 |
|
Amazon SES
|
11 |
Tools most often detected on the same sites as AuthSMTP.
Recent launches we can show
9 of the 28 sites using AuthSMTP are product launches we list individually. The other 19 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
123greetings.com
veddai.com
AI
DNS Lookup Tool - AuthLookup.com
Developer Tools
Better Web Forms
Trustworthy Estate Planning | Advisor-Led Estate Planning Coordination
Finance
StubTurtle | Tickets to Table for Venues, Events & Tours
E-commerce
Free Chatbot, Comments, Reviews & Surveys Widgets
Yogile
Social
Scaleway
Developer Tools
The StackScope API serves all 28 sites using AuthSMTP, filterable and exportable, from £15 a month.