There are several ports used for email transmission, each with its specific purpose: - Port 25: Traditionally used for SMTP relay but is often blocked by ISPs due to spam concerns. - Port 587: Recommended for SMTP submission with STARTTLS encryption. - Port 993: Used for secure IMAP access. - Port 465: Specifically designated for secure SMTP communication using SSL/TLS.
Port 465 stands out because it is designed exclusively for secure email transmission, reducing the risk of data interception.