[maicro]

All valid points, but I will say services don't help in this situation - I received an email from @redditmail.com recently, which is real and part of reddit but feels off on first glance.

Couple that with gmail having no way to show the full email address (by default - I know you can hover, etc.), rather than the sender-provided "sender name", and my false-positive rate for at least double checking and confirming the sending domain is kinda high...better that than a bunch of false-negatives of course.