Mateusz Kosobucki

Mateusz KosobuckiAug 14, 2026

I shipped a free cold email audit last week. Then I realised it was grading the wrong domain. Here is the thing every audit tool I have seen gets wrong. You point it at acme.com and it grades SPF, DKIM, DMARC on acme.com. But nobody sends cold email from acme.com. You send it from getacme.com and tryacme.com, separate domains, warmed for weeks, kept well away from the domain your invoices and contracts live on. So the audit measures a domain that carries none of your campaigns. And it is confidently wrong in both directions. Your sending domains are perfect, your brand domain is missing DMARC, and the tool hands you a scary number for a problem that is not costing you a single reply. Or your brand domain is spotless, your campaigns are going out from a three week old domain with no DKIM, and the tool gives you a clean bill of health. I rebuilt mine around that. Three changes. It grades the domains you actually send from, one by one, and only those feed the reply estimate. It grades the brand domain separately, for what it is genuinely for: whether someone can spoof you, and whether a stranger can tell what you sell. And if you do not tell it which domains you send from, it refuses to produce a number at all. That is bad for a lead magnet. A confident figure about the wrong domain is worse. If you do not know which domains you send from, connect Instantly or Smartlead read-only and it reads them out of your mailbox list. The first thing it told me about my own setup: the domain I am about to run campaigns from is three days old. Warm it before you touch it. MIT licensed. Fork it, change my thresholds, ship your own. Link in the comments.

Mateusz KosobuckiJul 6, 2026

Software spend is up 15% this year. The fastest growth in a decade. And half of SaaS is still dying. Both true at the same time, according to SaaStr's latest breakdown. Here's what that actually means for founders building pipeline right now. The money isn't disappearing. It's consolidating. Buyers are spending more, but with fewer vendors. The average software stack is getting compressed, not expanded. Which means the race isn't "get noticed." It's "get trusted fast enough to be one of the survivors." That changes the GTM math completely. If buyers are cutting vendors, a cold email that says "quick question" doesn't just get ignored. It actively signals you're not worth the risk. Brand matters more when the stakes are higher. The founders winning pipeline right now aren't the ones sending the most outreach. They're the ones who showed up consistently in the feed of the right 200 people for 90 days before anyone's budget conversation happened. Visibility before intent. Not volume after it. The window where a founder can own a category with content alone is still open. But it closes when a funded competitor decides to spend on distribution. What are you seeing with your buyers right now, tighter budgets or just fewer seats at the table? #SaaS #GTM #FounderLedSales #B2BSaaS

Mateusz KosobuckiJul 3, 2026

Building in public feels like a distribution strategy. It isn't. Most B2B founders who build in public collect followers, not buyers. The audience they grow is other founders doing the same thing. Everyone is watching each other's dashboards. That's not pipeline. That's a mirror. Here's the thing nobody says: building in public works brilliantly for B2C or developer tools where your buyer IS a founder or engineer. But if your ICP is a VP of Operations at a 500-person company, she is not refreshing your MRR update on X. She's in meetings. She has a problem. She wants to know if you can fix it. The founders who build real B2B pipeline from public content do something different. They don't share "we hit $10K MRR" posts. They share "here's the specific mistake our first 20 customers made before they found us" posts. One is a vanity update. The other is a buyer magnet. The reframe: stop thinking of public content as transparency about your journey. Start thinking of it as pre-selling the problem you solve. Your ICP doesn't care how hard you worked. They care whether you understand their situation better than they do. When you write content that makes a buyer think "this person gets exactly what I'm dealing with", that's when building in public actually builds pipeline. What's the content you've seen from a founder that made you think "I need to talk to this person"? #B2BSaaS #FounderLedGrowth #GTM #ContentMarketing #SaaSFounders