Sites using SMTP Engine
Transactional email relay service detectable via SPF include for smtp-engine.com.
Found via: Product Hunt 1
SMTP Engine has been detected on a single launch we've crawled, IT and Compliance Jobs Isle of Man, on May 25, 2026.
It's most commonly paired with Microsoft 365, nginx, and Google Analytics.
Share of new launches using SMTP Engine
Each dot is one launch day. Line is the 7-day rolling average. Chart starts at first detection.
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
|
19.37% | 72.78% |
| #2 | – |
Amazon SES
|
3.73% | 14.01% |
| #3 | – |
SendGrid
|
2.88% | 10.82% |
| #4 | – |
Mailgun
|
1.26% | 4.74% |
| #5 | – |
Firebase Trigger Email
|
0.99% | 3.73% |
| … | ||||
| #63 | SMTP Engine 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. All 66 in Transactional Email →
Often used with
| Tool | Launches |
|---|---|
Microsoft 365
|
1 |
nginx
|
1 |
Google Analytics
|
1 |
Google Tag Manager
|
1 |
| HSTS | 1 |
Tools most often detected on the same launches as SMTP Engine.
