In email world, this is as far from 'good to go' as you can get. Good luck getting anyone to read your emails this way.

Do you run your email server? I run two, have next to no problems (the key is in setting up DNS correctly, as I mentioned) and keep getting told this by people who have never tried.

	▲	wwweston an hour ago \| parent [-]
		More elaboration on what’s involved in “correctly” would probably drive the point home — “this works because” vs “works for me.”