I've been getting more spam lately from "legitimate" companies. One of my email addresses leaked from a major open source project I corresponded with. Harvesters found it and now sell it to every small business and entrepreneur marketer you can think of. I get spam from CDNs, off-shoring companies, SEO/SEM, marketing, you name it.
Lots of them use sketchy services like reply.io to make it seem like a real person sent the email. And then another that looks like a reply to the first when you don't respond. And then another and another. Like Katie Malone at HawkSEM.com who 'personally' spammed me another 'reply' today. Essentially, folks like reply.io and similar automate the process of repeat spamming. Even their tag line is "Send Cold Emails That Feel Warm".
Here's a reality check for you: sending "cold emails" to a list of email addresses you bought makes you a spammer. Even if you try to make them appear personal. The giveaway is the tracking image (usually hidden or 1px by 1px white of course) and tracking links in every email so they can track whether you opened it and whether you clicked anything along with the unsubscribe link at the bottom. Except they don't label it as unsubscribe. It says "If you don't want to get any more emails from me, just let me know." with 'just let me know' as a link.
Be sure to mark every email like this you receive as spam so you don't get any more and so their reputation decreases enough to route all of this spam to everyone's spam folders.