Alternatives to Siel
10 alternatives to Siel in Email & notification APIs. Ones the founder approved come first; the rest are listings in the same category.
Mails.ai
Email infrastructure for AI agents
- Same category
- Startup
Fromseal
Email authentication monitoring and management platform that reads DMARC reports, checks DNS daily, and fixes SPF automatically
- Same category
Sendscape
Email API and SMTP relay with MCP server for AI assistants
- Same category
Sendmux
Email API that gives AI agents a real inbox with send, receive, and routing capabilities
- Same category
Claire Mail
Email, calendar and reminders in one fast app for Mac and iPhone, with AI that triages your inbox and preps your meetings
- Same category
MXValidation
Free email deliverability testing and spam score checker
- Same category
Bulk Email Checker
Fast, accurate bulk email verifier and validator service that cleans lists and prevents bounces
- Same category
- Established
Bextrad
Email verification, bulk list cleaning, lead generation and deep catch-all detection platform
- Same category
VeriMails™
Email verification with real SMTP checks and catch-all detection
- Same category
- Startup
- United States
Warmup Inbox
Email warmup service that improves deliverability and sender reputation
- Same category
- Slovakia