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 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. Was your question answered? Mark the post as best answer!