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SMTP (Simple Mail Transfer Protocol)
SMTP (Simple Mail Transfer Protocol) is a networking protocol for mail transfer. It's used to send emails from a mail client to a mail server and between mail servers.
Server-to-Server communication is typically done over port 25. Client-to-Server communication is typically done over port 587. Alternatively, port 465 can be used for client-to-server communication with TLS.
Configuration
SMTP Server
The SMTP server is a mail server that receives emails from a mail client and forwards them to their intended recipients. It's also responsible for receiving emails from other mail servers and delivering them to their intended recipients.
SMTP Client
The SMTP client is a mail client that sends emails to a mail server for delivery. It's also responsible for receiving emails from other mail servers and delivering them to their intended recipients.
Troubleshooting
SMTP Troubleshooting Cheat Sheet