Haren, a typo across 34 warmed domains nearly sank his agency

Taylor Haren says two weeks into his first full-service client, his team found a typo replicated across 34 warmed-up domains. Every lead who saw the email thought it looked like phishing. The client was RB2B, and Haren says the mistake cost him the money sunk into all that wasted infrastructure.

What kept it from being terminal was that a second set of infrastructure was already warmed and ready to swap in. Haren credits that backup with saving the campaign and, in his telling, the business itself.

How the setup was built

According to Haren's account, Adam Robinson came to his company, Sales Automation Systems, before RB2B launched. Robinson wanted infrastructure but asked for the whole funnel instead, so infra, lists, copy and campaigns all moved under one roof. That made RB2B the first full-service client. The team spent three weeks preparing and launched with 40 plus campaign variations, infrastructure, and copy written in Robinson's voice. The typo surfaced two weeks after launch.

Taylor Haren

@THArrowOfApollo

X

Two weeks in, we found a typo across 34 warmed-up domains.

Taylor Haren

@THArrowOfApollo

X

Luckily, we had a second set of infrastructure warmed up and ready to replace everything.

Haren says RB2B went on to become the company's most famous case study, with cold email driving 42% of revenue as the business went from $0 to $4M ARR in six months. That figure is the client's, it comes from one retelling by the vendor, and nothing in the post breaks it down by send volume or period.

For people sending

The transferable part is the redundancy, not the revenue claim. Warmup takes weeks, so a copy error baked into a live sending estate is effectively a dead estate unless a parallel set is already seasoned and sitting idle. Most senders treat backup domains as insurance against blacklisting or a Google suspension. Haren's version is insurance against your own quality control, which is the failure mode nobody budgets for because it feels avoidable right up until it happens across 34 domains at once.

It also argues for proofing copy against a rendered send before replication rather than after. A typo that reads as phishing does not just lose replies, it trains recipients and filters on a bad signal across every domain carrying it.

Haren's background is worth the one line of context. He learned infrastructure as an AE at SwipeJobs during COVID, took courses from Jesse Ouellette, and started Sales Automation Systems on the side as a deliverability service building domains, inboxes, warmup and backups for clients who had their own lists and copy. He now says the company sends about 12 million cold emails a month and has scaled to $2.5M ARR across 100 plus clients.