You may encounter username/password errors or other difficulties with viewing and sending emails if you are not using the most up-to-date IMAP settings.

Review that your email program is using the proper settings:

• Incoming Server: imap.mail.yahoo.com
• Outgoing Server: smtp.mail.yahoo.com
• Incoming Port: 993 (requires SSL)
• Outgoing Port: 465 (with SSL) or 587 (with SSL/TLS)
  It is necessary to enable SSL or TLS for Outgoing SMTP server.
• User name: full email address (for example, bill@yahoo.com or bill@rocketmail.com)
• Password: the password you sign in to Yahoo! with.

If you are having trouble setting up IMAP access:

• The manufacturer of your email program or mobile device will be able to advise you on the proper settings for their product.
• Review the manufacturer's help content or instruction manual for your mobile device or email program.
• Contact the manufacturer of your mobile device or email program for assistance.