B2B Bandits & Inbox Attack Review: A Deep Dive into Their Email & B2B Marketing Prowess

In the competitive world of B2B marketing and cold email outreach, few agencies stand out like B2B Bandits and Inbox Attack. These two powerhouse agencies specialize in unconventional B2B marketing strategies and high-converting email campaigns, respectively. With accolades like #1 Email Marketing Agency on Upwork globally and Top 10 B2B Marketing Agency on Clutch, they’ve worked with big names such as BigCommerce, Intuit Mailchimp, and Columbia University.

But do they live up to the hype? We analyzed real client feedback to bring you an in-depth review of their performance, workflow, strengths, and areas for improvement.

Pros: What Clients Love About B2B Bandits & Inbox Attack

1. Exceptional Cold Email & Lead Generation Results

Clients consistently report impressive conversion rates and high-quality leads generated through Inbox Attack’s email campaigns.

• "In less than one year, we helped our main client generate 165 meetings through cold email."
• "We’ve achieved around 70%–80% increase in conversion."
• "Our open rates increased by 30% and click-through by 10%."
• "Deliverability improved from 46% to 76%, with open rates jumping from ~8% to ~19%."

These numbers speak volumes about their copywriting expertise and deliverability optimization.

2. Strong Technical & Creative Expertise

Unlike many agencies that focus solely on copywriting or automation, Inbox Attack excels in both.

• "They handle the technical aspect of email deliverability. It doesn’t matter how well your emails are written if no one reads them."
• "Nate has a skill for writing to different audiences that I haven’t seen before."
• "Seth’s knowledge of Mailchimp is truly unmatched (as noted by Mailchimp themselves)."

This dual expertise ensures that emails not only look great but also land in inboxes.

3. Smooth Workflow & Excellent Communication

Clients praise their responsiveness, organization, and proactive approach.

• "Seth gets back to me within the hour or less—even during holidays."
• "Their project management is excellent. They always follow up on every stage."
• "We had one-hour focused calls when necessary, otherwise collaborated over Google Docs."

4. High Client Retention & Trust

Many clients return for multiple projects, a testament to their reliability and results.

• "We trust them more than any other vendor we’ve worked with."
• "I’m already considering Inbox Attack for another project."
• "Working with Seth and Nate continues to be a pleasure."

Cons: Areas Where They Could Improve

While overwhelmingly positive, some clients noted minor areas for improvement:

1. Follow-Up on Generated Leads

• "They could follow up more once the prospects start coming."
  Some clients wished for more hands-on nurturing after initial outreach.

2. Done-for-You vs. Consulting Approach

• "I wish they offered a fully done-for-you service instead of just consulting."
  While their training is valuable, some businesses prefer full execution.

3. Limited In-Person Engagement

• "I’d like Seth to attend email conferences with us to stay updated on trends."
  A few clients wanted more industry event participation for fresh insights.

Final Verdict: Should You Hire B2B Bandits & Inbox Attack?

✅ If you need:
✔ High-converting cold email campaigns
✔ Expertise in both copywriting & deliverability
✔ Responsive, organized project management
✔ A trusted long-term marketing partner

❌ If you prefer:
✖ Fully hands-off, done-for-you services (they lean toward consulting)
✖ Agencies that handle post-outreach nurturing (they focus on initial outreach)

Conclusion: A Top-Tier Choice for B2B & Email Marketing

B2B Bandits and Inbox Attack deliver measurable results, backed by real client success stories. Their technical know-how, creative copywriting, and client-focused approach make them a standout choice for businesses serious about scaling through email and B2B marketing.

Final Rating: ⭐⭐⭐⭐⭐ (5/5)

Ready to boost your email campaigns? Based on client feedback, they’re worth every penny.