Hallo, Kunden mit einer gmail.com Adresse bekommen keine E-Mails mehr automatisch zugesendet, da diese offensichtlich blockiert werden. Hat jemand eine Idee, wie ich das verhindern kann? Habe den Cloudshop und die Fehlermeldung lautet wie folgt (Kundenadresse habe ich verfremdet): This is the mail system at host shopsrv-37.h.gambiocloud-services.com. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system <xyz@gmail.com>: host gmail-smtp-in.l.google.com[66.102.1.27] said: 550-5.7.26 Unauthenticated email from arcor.de is not accepted due to domain's 550-5.7.26 DMARC policy. Please contact the administrator of arcor.de domain if 550-5.7.26 this was a legitimate mail. To learn about the DMARC initiative, go 550-5.7.26 to 550 5.7.26 https://support.google.com/mail/?p=DmarcRejection ffacd0b85a97d-4376abb3a6esi3188822f8f.335 - gsmtp (in reply to end of DATA command) Reporting-MTA: dns; shopsrv-37.h.gambiocloud-services.com X-Postfix-Queue-ID: A88873928653 X-Postfix-Sender: rfc822; susan.ehmke@arcor.de Arrival-Date: Sun, 8 Feb 2026 14:03:05 +0100 (CET) Final-Recipient: rfc822; xyz@gmail.com Original-Recipient: rfc822;xyz@gmail.com Action: failed Status: 5.7.26 Remote-MTA: dns; gmail-smtp-in.l.google.com Diagnostic-Code: smtp; 550-5.7.26 Unauthenticated email from arcor.de is not accepted due to domain's 550-5.7.26 DMARC policy. Please contact the administrator of arcor.de domain if 550-5.7.26 this was a legitimate mail. To learn about the DMARC initiative, go 550-5.7.26 to 550 5.7.26 https://support.google.com/mail/?p=DmarcRejection ffacd0b85a97d-4376abb3a6esi3188822f8f.335 - gsmtp Dank im voraus! LG, Susan