Within mimecast, I personally added all 9 CC URLs from the CC safelist our domains list. As a CC user, I cannot receive my own test emails, so I use my personal email to preview. Other colleagues also subscribe using personal email addresses if they want any chance at receiving emails we send using CC. My IT dept advised me to instruct colleagues who want to subscribe with work email address to whitelist CC domains -- but it doesn't work. CC has no other resolution.
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