Postman Agency Reviews 13

HORRIBLE AGENCY! They destroyed my email account

I'm a small business owner who hired Postman Agency to manage my Klaviyo email marketing. It was one of the most costly mistakes I've ever made, and I mean that literally.
During their time managing my account, they made a series of serious errors: mass-suppressing subscribers who never opted out, sending to contacts they shouldn't have, and leaving my account in a state of disarray I'm still cleaning up years later. I lost over 90,000 subscribers, people I had spent years and real money building relationships with through organic growth, ads, and pop-ups. That list was one of my most valuable business assets. It's gone.
Today, 74% of my Klaviyo database is suppressed. My active list dropped from over 100,000 to under 34,000. The revenue impact is impossible to fully quantify, but it has affected my business every single day since.
When I asked for a refund, they refused. I escalated to a chargeback with American Express. I lost that too. So not only did they damage my business significantly — they kept every dollar they charged me while doing it.
I don't write reviews often. I'm writing this one because no other small business owner should go through what I went through. If you're considering hiring this agency to manage your email marketing, please do your due diligence first. The cost of their mistakes will far outlast the cost of their fees.

Working with Sami and the Postman team has been a great experience for us. Especially in challenging phases, they helped us push our email marketing to a completely new level.

The collaboration is straightforward, strategic, and performance-focused. We’ve significantly increased our email revenue and built much stronger flows and campaigns together. What we value most is the constant exchange and their proactive mindset, they really think along with the business.

Highly recommended for any eCommerce brand looking for a reliable, long-term email partner.

Postman Agency really brought our email marketing to the next level. We worked with them for a few months to run campaigns and improve our email retention strategy. Their design team is very talented. They produce solid creative on their own without needing much help from me other than general oversight and final approval. They also picked up on the nuances of marketing our niche products fairly well and quickly, which isn't easy. I did have some trouble with their collaboration tools, as I'm not a fan of Figma and we don't use Slack. That combined with the time difference made collaboration cumbersome at times. Ultimately, the quality of their work more than made up for this. Sami is a great communicator and very knowledgible, a pleasure to work with. Everyone on their team was friendly and helpful throughout our partnership. Highly recommend.

Absolutely fantastic to work with! Not only was the ROI more than 10X. It improved our email marketing outreach!

Postman Took Our Retention to the Next Level

As the founder of Visionfull, bringing Postman on board was a turning point for our business.

Before them, our email strategy was basic at best. But once they took over, we saw a sharp increase in AOV, LTV, and returning customer rate. Their retention strategy is thoughtful, data-driven, and focused on real results—not vanity metrics.

They quickly understood our brand, built flows and campaigns that made an immediate impact, and became a true extension of our team.

If you want an agency that actually moves the needle on retention, Postman is it. We haven’t looked back since.

Postman has been a game changer for our 2 brands over the last 6 months.
They revamped our whole email system, redoing flows and improving our overall performance drastically.
During our partnership, they've more than doubled our email revenue share, taking it from under 10% to over 20% (which is an ROI of more than 25). Their responsiveness is unmatched. Usually they respond within minutes and help us address any issues/ changes, even on weekends for urgent matters.
Design wise, they have very talented designers on board and have nailed our brand's identity.

If you are searching for an email agency with amazing service and an incredible ROI without crazy prices that other email agencies charge, Postman is a great choice.

Postman Agency helped our brand with email automations, and it was a seamless collaboration. They are true experts in their field, advising us on the best design solutions, cadence, and flows to implement and test. They made valuable observations and improvements along the way, not only to our automations but also to our day-to-day campaigns. As a result, we’ve seen our channel sales grow. We definitely recommend working with them.

I've been working with them for years and they have helped my business grow in a way that I did not expect. They have done a fantastic job creating and managing my email and SMS flows and campaigns. I highly recommend Postman.

Postman Agency has done a fantastic job with my email marketing over the last 6 months. During this time they have:
- Professionalised my regular newsletter
- Improved my deliverability
- Written my newsletter every week
- Written great, engaging content in my brand voice
- Run dozens of A/B tests to improve open and click rates
- Created many automation flows to improve my conversions and create real conversations with my subscribers.

The team is easy to work with, communicates well and has done a great job over the last 6 months. If you need help getting your email marketing rocking, I highly recommend them.

As a fractional CMO working with multiple 7- and 8-figure eCommerce brands, I’ve tested countless email marketing agencies over the years—some promised the world, others had a good start but quickly fell off. That all changed when I introduced my clients to Postman.

After struggling with agencies that lacked strategy, accountability, or the ability to drive real revenue growth, my clients finally found a partner that delivers. We’ve now been working with Postman for over three years, and the results speak for themselves. Their approach is performance-driven, proactive, and deeply strategic. From advanced segmentation and data-backed flows to highly optimized campaigns, they’ve consistently increased customer retention, lifetime value, and overall revenue.

What truly sets them apart is their team. They don’t just execute—they think like operators, constantly testing, optimizing, and refining strategies to ensure peak performance. The level of attention they give to each client is rare in this industry.

I’ve now recommended Postman to multiple brands, and every single one has stayed with them. If you’re an eCommerce brand looking for an email & SMS partner that actually moves the needle, stop wasting time with agencies that overpromise and underdeliver—Postman is the real deal.

Looking forward to many more years of working together!

Postman Agency was excellent to work with. They evaluated our existing email structure, gave us a clear and detailed plan for improvements, and implemented it quickly and expertly. I would highly recommend them for your company's email marketing needs.

Great Team to work, very easy, super responsive and great communication, as well very well organised. Was easy to communicate and work with team, recreate the flows, polish the e-mails and reached the goals of our target in less than 2 months, definitely recommending.