If you want your correspondents to bother to read your email, put something useful in the subject line. Folks who receive dozens of emails a day don’t have time to respond to stuff labeled “cute,” “LOL,” and other silliness like that. If you want me to look at what you’ve sent, tell me what it is. If it isn’t important enough for you to label properly, it almost certainly isn’t worth my time to read it.
This is especially true of anything with an attachment. I don’t trust attachments, and if you want me to go to the trouble of downloading one, checking it for viruses and other malware, then running it in a sandbox if it makes me nervous, you’d darned well better make me believe it’s worth my time. Otherwise, you’re liable to end up on my “special” filter list, if you get my drift.
There. I said it, and I’m glad!