Mail delivery failed: returning message to sender

Here we go again.

    host gmail-smtp-in.l.google.com [172.253.122.27]

    SMTP error from remote mail server after end of data:

    550-5.7.26 Your email has been blocked because the sender is unauthenticated.

    550-5.7.26 Gmail requires all senders to authenticate with either SPF or DKIM.

    550-5.7.26

    550-5.7.26  Authentication results:

    550-5.7.26  DKIM = did not pass

    550-5.7.26  SPF [riversedgecamping.ca] with ip:

    [65.254.253.145] = did not pass

    550-5.7.26

    550-5.7.26  For instructions on setting up authentication, go to

    550 5.7.26  https://support.google.com/mail/answer/81126#authentication ada2fe7eead31-4e6f19f66bdsi1786302137.226 - gsmtp.

Have delt with htis numerous times. NEEDS TO BE FIXED!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!