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Mail Distribution Systems — Common Ports

System

Community software entries: links are references, not individual verification.

Role Unconfirmed (1)

158
tcpSystem

Distributed Mail System Protocol port for mail routing and transmission

MailSystem

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 Mail Distribution Systems use?

Mail Distribution Systems commonly uses these ports: 158. These are community database references — actual configuration may differ.

How do I check if Mail Distribution Systems is running?

Run sudo ss -tlpn 'sport = :158' 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 Mail Distribution Systems belong to?

Mail Distribution Systems belongs to the System category. This page lists the software's port associations and their roles.