Ik krijg bij het reageren op een email de volgende foutmelding. Die melding is anders dan in vergelijkbare vragen over SMTP error.
xxx.yyy@gmail.com
host gmail-smtp-in.l.google.com [74.125.71.26]
SMTP error from remote mail server after pipelined 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 [planet.nl] with ip: [84.116.50.18] = 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 ffacd0b85a97d-3502b99f194si14330049f8f.253 - gsmtp
Wat kan ik nu het beste doen?