Don't believe in email. No, don't use it at all! It's the easiest Form of communication but also the easiest way to go unnoticed. If at all, you'll be responded to at the receiver's pace and that hardly ever matches yours.
Everyone I work with hears me stress the importance of phone calls. There's nothing better than getting someone on the line. Further, if you don't get them on the phone, find something other than email. Yes, there are better options.
You know what everyone reads? WhatsApp or iMessage/SMS! Why? Because it could be the wife/husband, the kid, a close friend or a mistress/affair. You get the point...these are still preferred private channels. They are always looked at first, before any email. They also usually get immediate responses. Yes, they are personal and therefore, relevant.
Now, be forewarned. You're not "wanted" there. If you're spamming or are just annoying, you will probably do more harm then good by accessing this channel. Get permission! It's not a place you "go" for your benefit without a benefit to the other party. Hence, if getting someone's mobile number, ask if they use iMessage or whatnot (whatever but email). If they say yes, you're basically given permission to try the channel.
You'll see by the response you get when using it the first time whether you're allowed to use it again. Often, if you call, no one answers. Follow it up though with a quick message, stating what you want (and hopefully how you can "help" the other party) and you're in.
Be creative and not lazy. Email is lazy communication. You shoot it off and are done with it. The other person has to "work" for you to get a response. Even though messaging apps arr essentially the same thing, they still have a different feel to them. This is why they still matter and emails don't.