Subject: Delivery Status Notification

From: Mail Delivery Service <[email-masked]>
Date: Thu, 24 Jul 2025 21:55:22 +0200

- These recipients of your message have been processed by the mail server:
[email-masked]; Failed; 5.3.0 (other or undefined mail system status)

    Remote MTA gmail-smtp-in.l.google.com: network error

 - SMTP protocol diagnostic: 550-5.7.26 Your email has been blocked because the sender is unauthenticated.\r\n550-5.7.26 Gmail requires all senders to authenticate with either SPF or DKIM.\r\n550-5.7.26 \r\n550-5.7.26  Authentication results:\r\n550-5.7.26  DKIM = did not pass\r\n550-5.7.26  SPF [post.nuhet.se] with ip: [217.169.118.19] = did not pass\r\n550-5.7.26 \r\n550-5.7.26  For instructions on setting up authentication, go to\r\n550 5.7.26  https://support.google.com/mail/answer/81126#authentication a640c23a62f3a-af47c3966f3si1