Forum Discussion
[HELP] Website in signature block by Exchange server
Hi everybody,
We're having a strange issue with Exchange Server, some emails send by our users are correctly delivered to the Exchange servers but (randomly) not to the final user.
We're using Gmail and the issue only occurred with Exchange Server.
We checked the SPF, DKIM and DMARC and everything is correct, plus the logs specify that the email are "DELIVERED". But recipient doesn't receive them or sometime in spams.
We contacted an Exchange administrator who told us, that the problem was due a link to a website in the signature which was considered as a phishing website (actually the website was attacked and blacklisted in January but it is clean now and not on any blacklist that we can find). He told us he send a request to allow this website but the issue persist.
How do we remove the website of the signature from the "Microsoft" suspicious/blacklist?
2 Replies
Two culprits, the html anchor around an image only has http:// and not https://
And the VISUAL part of your signature that might be something like:
W. example.com Needs to be the same as the href itself which needs to be https://example.com
Not as cosmetically aesthetic, but fixes the issue.
Hi GLorent
you can use the delist service from Microsoft to whitelist your domain.
https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/use-the-delist-portal-to-remove-yourself-from-the-office-365-blocked-senders-lis?view=o365-worldwide
also analyze the message header in microsoft MHA to check what is causing the block.
https://mha.azurewebsites.net/
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