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Running 3.0.6 on Centos 7, fully patched.
Even with a new campaign message, tons of style code with spam links is injected into the html editor area. I can send the raw code, but it's too big for your forum service. Let me know how to proceed.
One of your browser extension is inserting code into the WYSIWYG editor when you were composing your email (for example, Grammarly browser extension is known to do just that).
If the issue is resolved, you'd need to track down this browser extension that inserts code into the WYSIWYG editor when you were creating/editing your campaign and disable it.
In Firefox, Ad Blocker Ultimate was the culprit, disabled it and it worked great! Thanks for your help. Mark