If your using outlook. Goto File > options > Mail > then scroll down to the " send messages " section . In there you should see a checkbox for " warn me when I send a message that may be missing an attachment. "

Once that's enabled outlook looks for keywords in the body of the email such as attached, attachment, e.t.c. and will warn you if there's nothing attached.

So if you at any point in the email say " please see attached, issue is attached, screenshot attached e.t.c. " then you'll be in the clear.

Gmail is so nice because after it's done scouring through my potentially private emails it lets me know if I said "is attached" but didn't attach any files

And you've written some painfully edited highly professional email to your professor or boss and the response you get back from them is a single sentence, not even a signature.

So glad they made it such a point to teach us to write professional emails in my freshman year of college.

Put the address in last. You can't accidentally send an unfinished email if there is no-one to send it to.

Thunderbird now has a really useful reminder popup for that!

Every fucking time! I honestly think I have some type of aversion to attaching the file before hitting send.

On Kmail you have the option to send with delay.