Sites using SMTP Engine
Transactional email relay service detectable via SPF include for smtp-engine.com.
Found via: Product Hunt 1 · PeerPush 1
SMTP Engine has been detected on 2 launches since first appearing in May 2026. Most recent detection: REG121, on August 4, 2026.
It's most commonly paired with Google Analytics, Google Tag Manager, and Google Workspace.
Share of new sites using SMTP Engine
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
|
5.36% | 62.86% |
| #2 | ▲1 |
SendGrid
|
0.66% | 7.79% |
| #3 | ▼2 |
Amazon SES
|
0.64% | 7.45% |
| #4 | ▲1 |
MailChannels
|
0.52% | 6.10% |
| #5 | – |
Mail.Baby
|
0.45% | 5.24% |
| … | ||||
| #99 | 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 150 in Transactional Email →
Often used with
| Tool | Sites |
|---|---|
Google Analytics
|
2 |
Google Tag Manager
|
2 |
Google Workspace
|
1 |
Microsoft 365
|
1 |
Google Search Console
|
1 |
Tools most often detected on the same sites as SMTP Engine.
Recent launches we can show
2 of the 2 sites using SMTP Engine are product launches we list individually.
