host gmail-smtp-in.l.google.com [142.250.102.27]
   SMTP error from remote mail server after pipelined 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 [hotellesbruyeres.be] with ip:
   [37.230.98.4] = 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 r17-20020a170906365100b00a51a12d91aesi4167499ejb.605 - gsmtp

Ik krijg G mails binnen , maar kan deze niet beantwoorden host gmail-smtp-in.l.google.com [142.250.102.27] SMTP error from remote mail server after pipelined 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 [hotellesbruyeres.be] with ip: [37.230.98.4] = 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 r17-20020a170906365100b00a51a12d91aesi4167499ejb.605 - gsmtp Wat kan ik doen ?