SMTP

Description

This indicates an attempt to use the SMTP (Simple Mail Transfer Protocol) protocol.
SMTP is a protocol for e-mail transmissions. Its default TCP port is 25. Clients typically use SMTP for sending messages and POP3/IMAP for retrieving messages.

Affected Products

SMTP

Impact

Network resources consumption

Technology

Browser-Based, Network-Protocol, Client-Server, Peer-to-Peer, Cloud-Based, Mobile-Device

Behavior

• Reasonable

Default Ports

• TCP/25
• TCP/465
• TCP/587
• TCP/2525