Cold Outreach Email? Do This to Ensure Email Results


We've compiled the best advice on how to clean up lead lists and what to do when contacts don’t have valid email addresses. In this post we share what we test, what worked for us, and what didn’t. We also explain alternate outreach methods you can try when email alone won’t cut it.

Table of Contents

Quick answer up front

If we only do cold email, we remove any contact that does not have a verifiable email address. If we plan to stack channels, we keep phone-only or website-only contacts and try other methods like ringless voicemail, voicemail drops, SMS (be careful), cold calling, or contact form submissions.

Cleaning up leads for cold email

When we scrub a list for a cold email campaign, we do a few simple steps:

  • Drop any address that bounces or is invalid.
  • Keep only verifiable emails for pure cold email campaigns.
  • Mark phone-only or website-only leads for alternate outreach instead of deleting them right away.

This keeps our cold email deliverability high. Sending to bad or non-existent emails wastes credits and hurts sender reputation. So if email is the only play, toss the bad ones.

When leads are still useful without an email

Not having an email does not always mean the lead is useless. Here are common options we use:

  • Voicemail drops / ringless voicemail
  • SMS campaigns (use with legal care)
  • Cold calling (we rarely do this)
  • Contact form submissions on the website

We keep these phone-only or website-only leads and route them into a different workflow. That way we can test other channels without losing the lead forever.

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Why voicemail drops failed for our tree service clients

We tested voicemail drops and ringless voicemail with tree service contractors. The result was not great. Here is why:

  • Many tree guys return missed calls immediately without listening to voicemail.
  • Ringless voicemail tools often dial twice. The first ring shows a missed call. Then the second call drops the audio into voicemail.
  • Most recipients would just call the missed number back. That created awkward live calls to our lines.
  • Those callback calls interrupted our workflow and led to confusing conversations. Tree contractors thought they had reached someone needing a job estimate.

So in this niche voicemail drops ended up being counterproductive. That does not mean voicemail drops won’t work in other niches. Every industry behaves differently. You must test to learn what works for your target audience.

How ringless voicemail usually works

Here’s the basic technical idea so you can decide if it applies to your niche:

  • The system sends a call to the target number to make the phone ring.
  • While the first call is ringing, the system sends a second call that goes straight to voicemail and plays an MP3.
  • If the recipient listens to voicemail, they hear your message. But if they call back the missed number, they reach you live.

This two-call method creates the missed call effect. In some cases that works great. In others, like with teams who return missed calls quickly, it backfires.

How we tried to fix voicemail drop issues

We tried a few fixes to reduce the awkward callbacks:

  • We stopped answering unscheduled calls on that number.
  • We set the voicemail to pick up faster so the message would go straight to voicemail instead of ringing through.
  • We built an automation to detect inbound calls from campaign numbers. If someone called, the workflow sent an automated text and email that said, “Sorry we missed your call. We left you a voicemail. Please listen and call back to follow up.”

None of these solved the core problem for the tree niche. People still called and expected to talk live. So we stopped using voicemail drops with that audience.

SMS can work, but we must be careful. Text marketing rules are strict. There are fines if you break TCPA rules in the U.S. Always get consent when you can and follow the law for each country.

Contact form submissions as an outreach channel

Contact form outreach can be a low-cost way to reach businesses that do not list a public email. There are tools and scripts that can find contact forms on websites and submit messages automatically.

We recently tested a paid contact form service. Here is what we learned:

  • The service we tried required a 10,000 contact minimum and charged $0.04 per contact. That is a $400 minimum buy-in.
  • The vendor claimed high open and conversion rates (they used numbers like 50% open rate and 35% conversion). We treat such claims with skepticism until we see real results.
  • There are DIY routes. Tools like GSA and the GSA contact form submitter can be set up on a VPS and run by your team. But setup and learning take time.

We had paid to set up GSA and a VPS in the past, but we did not run the system. So paying a provider for one test made sense for us. We paid $400 to test the idea with our tree contractor offer. If we get even a few clients from that test, it will pay for itself.

How to run tests without wasting money

We follow a simple test plan for alternate outreach channels:

  1. Pick one channel to test (voicemail drop, contact form, SMS).
  2. Set a small budget you can afford to lose as a test. For example, a $400 contact form run is reasonable in many niches.
  3. Send a clear, single-message test with one call to action.
  4. Track every response. Use UTM links or unique domains to measure conversions from that channel.
  5. Compare cost per lead or client to your normal cold email funnel.
  6. Scale only if the test meets your cost and conversion goals.

We won’t pour money into a channel unless the data shows it is profitable or gives a strategic advantage.

Practical voicemail script we used

Here is a short message we tested. Keep it simple and clear:

Hi, this is Bradley from TreeHQ. We found a listing for your company and want to confirm some details for a free directory entry. Please listen to the voicemail and then call back or visit treehq.com/your-company to update your listing. Thanks.

Short scripts like this work better than long ones. Speak like a human. Say where people can go to act. Use an easy URL or phone number.

Automation tips when using mixed channels

  • Put phone-only leads into a separate campaign so you can try SMS, voicemail, or form submits without affecting email reputation.
  • Use a unique phone number for voicemail drops so callbacks do not land in your main line.
  • Automate follow-ups. If someone calls back, send an auto-reply SMS and a follow-up email (if you have one) telling them how to book time.
  • Log each touch in your CRM so you know which channel generated which response.

When we keep a lead without an email

We keep a lead without an email when one of these is true:

  • They have a working phone number and we can try voice/SMS outreach.
  • They have a website with a contact form we can target.
  • They fit our ideal customer profile and are worth a manual reach out later.

If none of the above is true and we only plan to email, we remove the lead from the cold email list.

How industries differ

Every niche has different behaviors. Tree services behave one way. Other local businesses may listen to voicemails and respond to ringless voicemail. Some niches hate cold calls. Others answer every call because they have full staff and kitchen schedules. Test the behavior before you spend a lot of budget.

SmartBlast and similar services

We tried a vendor called SmartBlast.co that does contact form outreach. Their minimum buy is 10,000 contacts at $0.04 each. We bought one pack to test. Here is how we will judge it:

  • Response rate to the contact form outreach.
  • How many real leads and qualified calls we get.
  • How many clients sign up for our $99/month reviews service.

If the return on ad spend is good, we will scale. If not, we will try other tools or do the scraping ourselves with GSA.

Final takeaways

Keep things simple. If we only do email, drop invalid or missing emails. If we want to grow and stack channels, keep phone-only and website-only leads and test ringless voicemail, SMS, contact-form outreach, or calling. Each industry is different. A method that fails in one niche might win in another. Test small, track carefully, and scale what works.

FAQ

Do we delete leads without emails?

If our only outreach is email, yes. We remove leads without a verified email to protect deliverability. If we plan multi-channel outreach, we keep them in a separate list.

Can voicemail drops work?

Yes, they can work for some niches. We found they did not work well for tree services because those contractors quickly return missed calls. That behavior made voicemail drops counterproductive for us.

Are contact form submissions worth it?

They can be. Contact form outreach has low barriers and can reach businesses that do not publish emails. But providers vary. We recommend testing with a small budget first and tracking actual conversions.

What about SMS or text campaigns?

SMS can work and often gets attention. But rules are strict. Follow phone marketing laws. Get consent when possible and consult local regulations.

Should we cold call?

We avoid cold calling. It interrupts people and often annoys them. If you choose to call, do so with a clear value and only after testing other channels.

How do we measure success?

Track cost per lead and cost per client. Use unique links or phone numbers per channel. Compare acquisition cost to customer lifetime value before scaling.

How much should we spend on a test?

Start small. $200–$500 is a reasonable test in many local niches. The contact form service we tested required $400 as a minimum. That was an okay test budget for us.

We hope this helps. Try one alternate channel at a time, measure results, and keep what brings real customers. If you test, you learn. If you learn, you can scale.