POP3 uses port 110 (unencrypted) or port 995 (SSL/TLS). We strongly recommend using port 995 with SSL enabled for security. IMAP uses port 143 or 993 (SSL). SMTP uses port 25/587 or 465 (SSL).
For complete email protocol comparison and all port numbers:
This article has been consolidated into our POP3 vs IMAP guide for easier reference.
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