SMTP Port 587 vs 465: Current Outgoing Mail Settings
Current outgoing mail (SMTP) settings: server smaug.aso.com.tr, port 465, SSL/TLS, username = full e-mail address, “outgoing server requires authentication” on. Do not use port 25 in mail clients – ISPs block it.
| Setting | Recommended (encrypted) | Legacy |
|---|---|---|
| IMAP | smaug.aso.com.tr · 993 · SSL/TLS | mail.yourdomain.com · 143 |
| POP3 | smaug.aso.com.tr · 995 · SSL/TLS | mail.yourdomain.com · 110 |
| SMTP | smaug.aso.com.tr · 465 · SSL/TLS | mail.yourdomain.com · 587 |
| Port | Use |
|---|---|
| 25 | Server-to-server relay; blocked by ISPs for clients |
| 587 | Submission with authentication, usually STARTTLS |
| 465 | Submission over implicit SSL/TLS (recommended) |
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Frequently asked questions
Which SMTP port should I use?
465 with SSL/TLS (recommended) or 587 with authentication; never 25 in a mail client.
What is the difference between 587 and 465?
465 is encrypted from the start; 587 upgrades with STARTTLS. Both require authentication.
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