SMTP Port Explained: 25, 587, 465, and Which One You Should Use

• 27 June 2026
• by: Ravi Subramanian
• in: Email services
• Tags: email ports, port 587, smtp port
• note: no comments

What is an SMTP port and which should you use? A precise guide to ports 25, 587, 465 and 2525, STARTTLS vs SSL, and configuring email clients to send mail.

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