Unable to send email to Gmail address - Why?

This is what I get back from Google....

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

host gmail-smtp-in.l.google.com [172.253.63.26]

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 [joshuarevivalproject.org] with ip:

[66.96.189.5] = did not pass

550-5.7.26

550-5.7.26 To mitigate this issue, please visit Gmail's authentication guide

550-5.7.26 for instructions on setting up authentication:

550 5.7.26 https://support.google.com/mail/answer/81126#authentication e12-20020a05622a110c00b0041fe47da9desi2302693qty.316 - gsmtp

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