1. AC Question's Avatar
    I am receiving emails, but I am not able to send them. Failed to send (Error occurred on email server - 550 5.1.0 Authentication required.
    10-06-2014 06:59 PM
  2. B. Diddy's Avatar
    Welcome to Android Central! In your stock Email app, check the outgoing SMTP server settings, security protocol, port, and username/password, and make sure they are correct. Compare them with your email service's IMAP or POP3 settings (do a Google search for it, or contact your email service to find out the correct settings).
    10-06-2014 07:07 PM

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