Does AppleSupport@email.apple.com is a legitimate mail from apple for mobile replacement ?

There are certain tests and checks for 'Us users' to determine

what of those may be fake, scams or otherwise questionable;

in the above ^ reference article, available to read.

• Identify legitimate emails from the App Store or iTunes Store - Apple Support

//support.apple.com/en-us/HT201679

Since I seldom if ever, get anything like

that, I must be doing something correct.

What exact issue do you have with Apple?

Yes, I have had AppleCare and other Apple Support emails that have used that “AppleSupport@email.Apple.com” address in the past. These were auto-generated responses when a device was added to my support profile after I purchased the device. .