Reason: There was an error while attempting to deliver your message with xxx to xxx. MTA p3nlsmtp01-01.prod.phx3.secureserver.net received this response from the destination host IP - 142.250.115.27 - 550 , 550-5.7.26 Your email has been blocked because the sender is unauthenticated.
Gmail requires all senders to authenticate with either SPF or DKIM.
DKIM = did not pass
SPF [domain] with ip: [xxx] = did not pass
Solution: Add TXT record v=spf1 include:secureserver.net -all to your DNS records.
Last Updated: September 13, 2024
