I see this take constantly in sales communities: "your cold emails aren't working because your copy sucks." And sure, bad copy doesn't help. But I've run enough tests now to know that data quality matters 3-5x more than copy quality.
Here's the test I ran. I wrote three versions of a cold email. One was highly personalized with custom first lines. One was templated but relevant. One was completely generic.
Then I sent each version to two groups: leads from our old database tool (Apollo) and leads from CorporateOS, which builds fresh lists instead of using a static database.
Results:
With Apollo leads: personalized email got 2.1% reply, templated got 1.4%, generic got 0.8%.With CorporateOS leads: personalized email got 6.3% reply, templated got 4.9%, generic got 3.1%.
The generic email sent to fresh, relevant leads outperformed the highly personalized email sent to recycled database contacts. That's wild.
The takeaway isn't that personalization doesn't matter. It does. But the foundation is the data. If you're emailing someone who left the company, or someone who got the same type of email from three competitors this week, it doesn't matter how good your first line is.
Most sales teams optimize the wrong variable. They A/B test subject lines when they should be A/B testing lead sources.
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