One Cold Email to Jason Lemkin. A Decade Later: $35M Series B.

In the early days of Mangomint — a software platform for salons and spas — Daniel Lang sent a cold email to Jason Lemkin.

Lemkin replied within a few hours. He made a small investment. He stayed involved.

Ten years later, Mangomint announced a $35M Series B led by Altos Ventures, with SaaStr Fund participating. The company had processed over $1 billion in transactions. By any measure, it was one of the most successful vertical SaaS stories of the decade.

It started with a cold email.

Who Jason Lemkin Is

Jason Lemkin founded SaaStr, the largest community for SaaS founders and investors in the world. He manages the SaaStr Fund and has been unusually transparent about how he makes investment decisions — including his openness to cold email.

His most famous quote on the subject: "Founders can get in touch with virtually any VC by sending a cold email, as long as the cold email is really, really good."

He has publicly credited cold emails for his investments in Talkdesk (now valued at $10B), Salesloft (acquired for $2.4B), Pipedrive (acquired for $1.5B), Logikcull (acquired for $270M), and Algolia ($2.25B valuation). Mangomint is the most recent addition to that list.

This is not a VC who treats cold email as a burden. It is a VC who has built his portfolio on it.

What Made the Mangomint Email Work

The Mangomint cold email has not been published verbatim, but from interviews with Lemkin and Lang, its structure follows the same pattern as every other successful cold email in his portfolio:

1. A specific, vertical SaaS thesis

Mangomint wasn't pitched as "software for small businesses" or "scheduling software." It was pitched as software specifically for salons and spas — a market Lemkin could size, a problem he could research, a customer he could call.

Vertical specificity is a credibility signal in itself. It means you've done the work to understand a niche, not just a category.

2. Early but real traction

The email showed traction signals — not hockey-stick growth, but real customers paying real money. Lemkin's standard: if the email doesn't include at least one concrete metric, it doesn't rise to the level of "really, really good."

3. A thesis-fit signal

Lemkin invests in SaaS at the sub-$1M ARR stage if the founder understands their market deeply. The Mangomint email demonstrated this understanding. It wasn't a generic pitch — it was a pitch by someone who knew why salons weren't well-served by existing software.

The Long Game

What makes the Mangomint story unusual is the timeline.

The initial cold email and investment happened years before the $35M Series B. That's not a story of "cold email → immediate large check." It's a story of "cold email → relationship → follow-on investment as the company scaled."

This is actually more common than founders realize. Many VC relationships start with a cold email that produces a small check or just a conversation. The large check comes later, when the relationship has history and the traction is undeniable.

Lemkin's framework for this: He makes small initial investments in founders he finds compelling even at the earliest stages. If they execute, he has a pre-existing relationship when the company is raising a meaningful round. If they don't execute, the downside is small.

The implication for founders: a cold email that produces a $25K angel check today might be the most valuable email you ever send — not because of the $25K, but because of who wrote it and what they'll do when you hit $5M ARR.

Vertical SaaS and the Cold Email Advantage

One underappreciated dynamic in the Mangomint story: vertical SaaS companies are unusually well-suited to cold email investor outreach.

Here's why. A vertical SaaS pitch can be made legible in one sentence in a way that horizontal software cannot:

• "CRM for yacht dealerships" immediately conjures the customer, the problem, and the market
• "Software for salon booking" is immediately understood by anyone who has been to a salon
• The investor can verify your market claims with a five-minute Google search

Horizontal software requires longer explanations, more context, more trust. Vertical SaaS frontloads credibility because the market is visible.

If you're building vertical SaaS, your cold email has a structural advantage. Use it.

What $1B in Transactions Looks Like From a Cold Email

Daniel Lang sent a cold email to an investor he had never met. That investor replied the same day. Eleven years later, that company had processed more than a billion dollars in transactions through its platform.

The cold email did not do any of that. The product did. The team did. The execution did.

But the cold email opened the door to the relationship that funded the execution.

That's what cold email can do. It can't build your company. It can't close your customers. It can't make your product work.

It can open one door. The rest is up to you.