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Many providers (like Gmail and Yahoo ) now require OAuth2 or Two-Factor Authentication (2FA) . If you have 2FA enabled, your standard password will no longer work for IMAP; you must generate a unique App Password through your provider's security portal.

Standard IMAP typically uses port 993 for secure SSL/TLS connections or port 143 for non-secure connections. Using the wrong port—or the wrong encryption method for a specific port—will result in a "Connection Refused" error. why-won-t-imap-work

Even with perfect settings, the "pipeline" between you and the server can be blocked. IMAP email broke Outlook, can't get it working again Many providers (like Gmail and Yahoo ) now

Repeated failed attempts can trigger a temporary IP block or account lockout from the provider's side to prevent brute-force attacks. 2. Structural Configuration Errors Using the wrong port—or the wrong encryption method

IMAP requires three specific "keys" to open the door: the server address, the port number, and the encryption type.

The most frequent reason IMAP fails is a breakdown in "trust" between your client and the server.