🌐 Providers
Provider Database
Sift uses a comprehensive database of email providers fetched from Quantium servers. The database is regularly updated to include new providers and patterns.
Major Providers
Global Services
- Gmail: gmail.com, googlemail.com
- Outlook: outlook.com, hotmail.com, live.com
- Yahoo: yahoo.com, ymail.com, rocketmail.com
- iCloud: icloud.com, me.com, mac.com
- AOL: aol.com, aim.com
- ProtonMail: protonmail.com, pm.me
Regional Providers
- Mail.ru: mail.ru, inbox.ru, list.ru, bk.ru
- GMX: gmx.com, gmx.net, gmx.de
- Web.de: web.de
- Yandex: yandex.ru, yandex.com
- QQ: qq.com, foxmail.com
- 163: 163.com, 126.com
Provider Detection
MX Pattern Matching
Sift identifies providers by:
- Direct domain matching
- MX record patterns (e.g., *.google.com for Gmail)
- Wildcard subdomain matching
- Parent domain detection
Business vs Free
- Free Providers: Personal email services
- Business Domains: Corporate and custom domains
- Hybrid Services: Both free and paid tiers
Custom Domains
Google Workspace
Detected via MX records pointing to:
- aspmx.l.google.com
- alt[1-4].aspmx.l.google.com
Microsoft 365
Detected via MX records containing:
- *.protection.outlook.com
- *.mail.protection.outlook.com
Other Business Services
- Zoho Mail
- FastMail
- Rackspace Email
- Custom mail servers
Output Files
Provider Files
Each detected provider gets its own output file:
gmail.txt
outlook.txt
yahoo.txt
[provider_name].txt
Special Categories
- others_with_mx.txt: Valid domains not in database
- others_without_mx.txt: No mail server found
- business_domains.txt: All corporate emails (optional)