Sites using OnlineSpamFilter 
Email security.
Found via: Product Hunt 1
OnlineSpamFilter has been detected on a single launch we've crawled, Increase website traffic & lead gen, on May 4, 2026.
It's most commonly paired with Microsoft 365, Fastmail, and SendGrid.
Share of new sites using OnlineSpamFilter
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 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
|
0.10% | 19.61% |
| #4 | ▲2 | Premium SMTP | 0.02% | 4.14% |
| #5 | ▼1 | SpamExperts | 0.02% | 3.17% |
| … | ||||
| #120 | OnlineSpamFilter Current page | <0.01% | 0.01% | |
Percentages show adoption among indie launches: the share of all analysed launches, and of launches using any Email Security tool. All 148 in Email Security →
Often used with
| Tool | Sites |
|---|---|
Microsoft 365
|
1 |
Fastmail
|
1 |
SendGrid
|
1 |
PHP
|
1 |
WordPress
|
1 |
Tools most often detected on the same sites as OnlineSpamFilter.
Recent launches we can show
1 of the 1 sites using OnlineSpamFilter are product launches we list individually.
