SMTP error 5.7.1 when emailing through a Rackspace hosted account

Discussion in 'Email' started by row01, Oct 28, 2010.

  1. Hi, I was hoping someone could shed some advice. I'm hosting an application here at Winhost and we are trying to email from an email hosted at Rackspace. This was the error:

    Transaction failed. The server response was: 5.7.1 <>: Sender address rejected: Access denied

    And these were the site credentials we use. The Winhost support team suggested I follow up here and see if anyone has any prior experience with this. They suggested it is possible to mail "from" a rackspace server.

    SMTP:, also tried
    Password: mypassword
    Port: 25

    Instructions for rackspace:
    Last edited by a moderator: Oct 14, 2015
  2. Ray


    Have you tried to contact Rackspace about this. If you are trying to send email through their email server there maybe a setting you are not aware of with Rackspace.
  3. FredC

    FredC Winhost Staff

    This error usually means the SMTP authentication credential is invalid

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