please could you help me find the true way to warmup my ip ?
If you're a residential customer warming up your IP won't work.
For information on email sending limits and blocked file extensions, see here. You won't be able to get around that.
If you're a business class customer, you need to be posting in the business class forums. This is for residential services.
I am not a Comcast Employee. I am just a customer, volunteering my time to help other customers here in the Forums. We ask that you post publicly so people with similar questions may benefit from the conversation.
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