SMTP Mail Transfer — Common Ports
Community software entries: links are references, not individual verification.
Default Ports (1)
TCP 25 carries SMTP mail transfer, commonly between mail servers. Mail clients should use the submission endpoint specified by their provider.
SimpleEmailTransportProtocol
Scope
Port associations on this page are community-database references (common usage), not a live measurement of any machine; confirm with the official documentation before deployment.
Frequently asked questions
What port does SMTP Mail Transfer use?
SMTP Mail Transfer commonly uses these ports: 25. The default port is 25. These are community database references — actual configuration may differ.
How do I check if SMTP Mail Transfer is running?
Run sudo ss -tlpn 'sport = :25' on the server to check for listening processes on these ports. Also use systemctl status <service> to check the service state. Without root you may not see other users' processes. A listening port alone does not prove the software identity — verify with the config file and process name.
What category does SMTP Mail Transfer belong to?
SMTP Mail Transfer belongs to the Email & Messaging category. This page lists the software's port associations and their roles.
Quick Info
- Categories
- Email & Messaging
- Associated ports
- 1
- Aliases
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