Error 553 while sending email from a POP client

Unverified email addresses you attempt to send from will cause this error. Use these steps to verify the address.


  1. Sign in to Yahoo Mail.
  2. Mouse over the Settings menu icon Gear Icon, then select Settings.
  3. Click Add beside "Accounts."
  4. Enter the email address and a description.
  5. Click Save.

A verification email will be sent to the address. Follow the email's instructions to verify the address, then you'll be able to send emails from it in a POP client.

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