You may contact Google using this form: https://support.google.com/mail/contact/bulk_send_new They won’t reply directly to you but if the problem is genuinely on their end, they will fix it within a few weeks.
However, I think that the problem you are experiencing is related to either the general quality of your mail-stream, the reputation of the sending IP addresses, or a specific element within the message for this one customer. I would suggest that you closely review the type of messages going out and the URLs in those messages. Ken. From: mailop <[email protected]> On Behalf Of Jan Ackerstaff via mailop Sent: Wednesday 14 July 2021 08:10 To: [email protected] Subject: [mailop] Blocked by gmail Hello there, we're a small data center and hosting company with some customers that are sending mails over our smtp relay. Since some days we're facing a problem with gmail recipients. Our system has detected that this message is 421-4.7.0 suspicious due to the nature of the content and/or the links within. 421-4.7.0 To best protect our users from spam, the message has been blocked. 421-4.7.0 Please visit 421 4.7.0 https://support.google.com/mail/answer/188131 for more information We had no problems last weeks with hacked mail accounts or spam. The send mails are 100% legit from a fairly large company, the mails are requested on the part of the customer (order confirmations). Since we get the same warning from other customers too, there is no common ground in the mail content. Is there any possibility to get contact to a person? Beste Grüsse / Kind Regards Jan Ackerstaff Fachinformatiker Systemintegration | Infrastruktur Services OMG.DE GmbH Kornkamp 40 26605 Aurich TEL: 0 49 41 / 60 44 5 - MAIL: [email protected]<mailto:[email protected]> Diese eMail enthält vertrauliche und rechtlich geschützte Informationen, die ausschließlich für den vorgesehenen Adressaten bestimmt sind. Sollten Sie nicht der vorgesehene Adressat dieser eMail oder dessen Vertreter sein, so beachten Sie bitte, dass jede Form der Kenntnisnahme, Speicherung oder Weitergabe des Inhalts dieser eMail unzulässig ist. Wir bitten Sie, in diesem Fall den Absender zu informieren und die eMail mit sämtlichen Anlagen dauerhaft zu löschen. Bitte denken Sie an unsere Umwelt, bevor Sie diese eMail ausdrucken! Hier erhalten Sie direkten Zugriff auf unser Support-Ticket-System: https://otrs.omg.de/otrs/customer.pl [cid:[email protected]]<https://www.facebook.com/omgdegmbh>[cid:[email protected]][cid:[email protected]]<https://www.instagram.com/omg.de_gmbh/>[cid:[email protected]][cid:[email protected]]<https://www.youtube.com/user/OnlineMedienGruppe/>
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