SMTP Submission — Common Ports
Community software entries: links are references, not individual verification.
Default Ports (1)
Port 587 is for message submission, commonly from a mail client to its provider. Distinguish it from server-to-server relay on port 25.
MailProtocol
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 Submission use?
SMTP Submission commonly uses these ports: 587. The default port is 587. These are community database references — actual configuration may differ.
How do I check if SMTP Submission is running?
Run sudo ss -tlpn 'sport = :587' 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 Submission belong to?
SMTP Submission 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
- —