I Blamed RocketReach for a 20% Bounce Rate. It Was SPF.

It Started With a Bounce Report

The bounce notice came in at 9:42 AM. Actually, no—it came in at 9:43, after I'd stared at the first one for a minute.

I'm not in sales. I'm the person who buys the sales team's tools. Since 2021, I've managed vendor contracts for a 180-person B2B company—about $120K a year across 25 vendors. When our VP of Sales asked me to evaluate a new B2B lead generation platform, I did what I always do: I made a spreadsheet. Then I made another spreadsheet.

The shortlist came down to RocketReach and People Data Labs. Different approaches, same goal: help our team find the right contacts and enrich them with data. I remember our developer highlighting one line in the RocketReach API documentation email lookup guide. It wasn't just the endpoint definition—it was the rate limit policy. That level of clarity matters when you're about to send 5,000 emails.

We ran two tests. First, we pulled 500 random contacts from the sales pipeline and matched them through RocketReach. Title match? Good. Company size? Good. Work email format? Mostly good. There were a few obvious bad records—one title was completely wrong, and two emails looked like typos. To be fair, that's about what I expected. No data provider is 100% accurate, and anyone who promises that is lying.

Then we exported a larger list and sent a test campaign through our sales engagement tool. That's where the story goes sideways.

The 20% Problem

Two hundred out of 1,000 emails bounced. A 20% failure rate. Our sales team had never seen anything like it. I immediately blamed the data. I even wrote a draft complaint to RocketReach support, mentioning their data enrichment capabilities and asking for a refund.

I didn't send it. Good thing.

Here's the thing I had to learn the hard way: in B2B lead generation, the list is only half the story. The other half is how you send. You can have the best contact data in the world, but if your email infrastructure isn't set up properly, you'll burn through it in one afternoon.

The Conversation That Changed My Approach

Our IT operations manager, who has a way of asking the obvious question, looked at the bounce report and said: "Did you check SPF?"

I assumed SPF was some kind of email tool we hadn't bought. It isn't. It's a DNS record.

What Is SPF and When Should a B2B Sales Team Use It?

SPF stands for Sender Policy Framework. It's a TXT record in your DNS that says which mail servers are allowed to send email for your domain. Receiving servers check this record before deciding whether to accept a message. If your domain's SPF record doesn't include the server that sent the email, the email can bounce. Or land in spam. Or disappear without a trace.

When should a B2B sales team use it? The honest answer is: any time you're sending from your own domain. But the practical answer is: before you launch any campaign, and again every time you add a new sending tool.

The classic example: your company domain is something.com. You send sales emails through Outreach or Lemlist or your own automation server. That tool sends from something.com (or a subdomain like send.something.com). If your SPF record for something.com doesn't list that tool's server, you're relying on the receiving server being lenient. Some are. Most are not.

In our case, we had no SPF record on the campaign subdomain at all. Not a bad record—no record. The receiving servers looked up send.something.com, found nothing, and applied the default rule: reject.

It wasn't a data problem. It was an authentication problem. The technical standard is RFC 7208, if you like reading standards. I mostly rely on the visual diagram our IT manager drew on a whiteboard—a square, a line, a stamp that said pass or fail.

The Revenue Distraction: RocketReach People Data Labs Revenue

One thing I kept running into while researching was "RocketReach People Data Labs revenue." I'll admit, I searched for it myself. Revenue feels like a trust signal. If a company makes a lot of money, their data must be good, right?

Maybe. But I can't verify private revenue numbers, and I don't think you should choose a tool based on them. What I can tell you from our tests is that both platforms have real strengths.

RocketReach felt more like a sales tool. Its Chrome extension and clean API docs made it easy to look up individual emails. People Data Labs felt more like a raw data warehouse. It was better for large batch enrichment requests, but the setup required more engineering time. Neither is "better" in absolute terms. They're different.

And neither one sent our email. Our SPF record did that.

Fixing SPF Without Losing My Mind

The fix itself is one line in DNS. Something like:

v=spf1 include:_spf.google.com include:your_engagement_tool.com ~all

But there's a catch. That line is only correct if it includes every service that sends email as your domain. Miss one, and you're back to bounces. We had to check our CRM, our marketing platform, our calendar scheduling tool, and our transactional email provider. It took an afternoon.

We also added DKIM. SPF says who is allowed to send. DKIM says the message wasn't tampered with. You want both. Our bounce rate dropped to below 2% after the DNS changes propagated. Same list. Same RocketReach data. Same sender. The only difference was authentication.

What I'd Do Differently Next Time

Looking back, I almost didn't check SPF because it wasn't on my procurement checklist. I was evaluating software, not DNS. Next time, I'm adding it.

If you're about to run B2B lead generation with a new tool, steal my checklist:

1. Identify every domain and subdomain that will send emails.
2. Check SPF records for each one—not just the root domain.
3. Add SPF and DKIM records before the first campaign, not after.
4. Send a 50-email test to addresses you control before the big blast.
5. Monitor bounce rates in the first hour.

That last one saved us once. You'll know within minutes if something is blocked, and you can pause before more damage is done.

If I had another month, I'd have dug deeper into the RocketReach API docs. The email lookup endpoint is straightforward, but the response objects take time. I'd want to test deduplication and matching logic before connecting it to our CRM. In the end, our developer handled that part. My job was the vendor relationship, and I nearly let a DNS problem ruin it.

The Bottom Line

So what's the verdict on RocketReach? I'll say this: the data enrichment capabilities are solid, the API documentation is refreshingly readable, and the support team was responsive once I actually talked to them. But no data provider can fix poor email authentication.

The old saying about measure twice, cut once applies to B2B sales tech too. For us, the cut was a 5,000-email campaign. The measurement we missed was SPF. Don't miss it.

One last note: this was accurate as of early 2025. APIs change, pricing changes, and email authentication standards keep evolving. Always verify with current documentation before making decisions. The RocketReach API documentation email lookup pages are a good starting point, but your DNS panel is the real place to look.