M365: customer email is quarantined when body includes specific website url

Question

Hello,
we have an issue with our customer, their emails are being quarantined when they include their website url in the body of the message. Is like the URL is in a kind of black list. But I did not find anything yet. And I can not search in microsoft like a blacklist they have or somehing like that.

Does anyone know how to handle this issue?

thanks in advance

Answer 1

Hi @Cristian Ruiz ,

You could see the quarantined messages here: https://security.microsoft.com/quarantine, you could find the reason and the specific part that caused the quarantine.
Check if the URLs are added to the block list here: https://protection.office.com/tenantAllowBlockList?viewid=Url

And for your situation, you could add your customers to the safe sender list with transport rules: Create safe sender lists in EOP

Best regards,
Lou

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Answer 2

Hello Zenqkilu,
thanks for your reply.

The URL was not added to our block list, and I know how to see the emails in quarantine, and how to create a rule to allow them.
But our customer is having trouble to send emails to us and to others recipients from different companys.
What we want to do is to resolve the issue to our customer. Is possible that the URL was put it in a global spam black list. I checked it using mxtoolbox but is not appering there.

Do you know if Microsoft has a own black list, and how to check the URL in it?

Answer 3

what are the quarantine details of these messages, like Quarantine reason, Policy type etc..?
Quarantine reason in spanish is: "Cebo de alta confianza" that I do not know how to translate to english, and the policy type is the default anti-spam policy.

My customer told me that their customers are having trouble to get their emails, I do not know what email systems they have. I suppose that several of them are having Exchange Online like us, but I do not have that information.

What We can see is that, when they put the URL "www.nameofthecompany.com.ar" in any part of the email, the email gets stuck in our EOP quarantine, and I am supposing that if EOP marks that email as spam, others antispam systems are doing the same.

Answer 4

Hi @Cristian Ruiz ,

Have you managed to solve the problem? It seems that I have a similar problem.

Thanks in advance