spf and DKIM authentication

Please Help,

Please update the SPF and/or DKIM records for my domain (brookspools.com) so I can send emails to gmail accounts.

Emails sent to gmail accounts are being returned with the following message:

SMTP error from remote mail server after end of data:

    550-5.7.26 This mail 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 [brookspools.com]

Thanks,

Dale Thevenet