Hi Im getting the following bounce back MCSpamSignature.sa.28.5. I believe the issue is caused from the following domains
Can we please have them delisted as they are legitiment
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Thank you for contacting Mimecast.
I have checked those two domains you have provided, they are legitimate and currently not being blocked.
I will need to look at an example of the email to identify what exactly is causing this rejected. Would you mind please opening a case by emailing firstname.lastname@example.org and marking it for my attention.