Email submission with STARTTLS encryption. The recommended port for sending emails.
Test it now with our Port Scanner
| Port | 587 |
|---|---|
| Service | SMTP Submission |
| Protocol | TCP |
| Encrypted | Varies |
| Common Use | Email submission with STARTTLS encryption |
Online: Use our Port Scanner — enter your IP and port 587.
Command line:
nc -zv your-server-ip 587 (Mac/Linux)
Test-NetConnection -ComputerName your-server-ip -Port 587 (PowerShell)
Check locally:
ss -tlnp | grep :587 (Linux) netstat -an | findstr :587 (Windows)