We have a tight budget–needing some affordable options, any advice?

I just started with a small-ish business recently. They’ve been around for 30+ years, but they were big on the “let’s send an email blast by manually entering our clients’ emails” approach. For reference, I was given a lead spreadsheet on Friday with 20,000+ names. I was asked to bring them into the 21st century, basically. The only issue is that, apparently, our monthly budget is pretty tight. I pitched some automation program options–I’m SharpSpring certified, so I tried to push it–and was told my budget was $50-100 a month. Yikes, right? My question is: is there any program that does automated lead tracking for an affordable price? I want to do as much as I can, just to prove that automation should be a part of the monthly budget in a big way.
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