587
SMTP Submit
Email message submission
TCP
Email
Port Information
Port Number
587
Protocol
TCP
Category
Common Usage
URL with Port
http://localhost:587 https://example.com:587
Node.js/Express Server
const express = require('express');
const app = express();
const PORT = 587;
app.listen(PORT, () => {
console.log(`Server running on port ${PORT}`);
});Docker Port Mapping
docker run -p 587:587 myapp # In docker-compose.yml ports: - "587:587"
Firewall Configuration
# Linux/Ubuntu firewall sudo ufw allow 587/tcp # Check if port is in use netstat -an | grep 587
Port 587 - SMTP Submit
Email message submission This is a TCP port commonly used in email applications. Port numbers range from 0-65535, with ports 0-1023 being well-known system ports, 1024-49151 being registered ports, and 49152-65535 being dynamic/private ports.