The Heyo Blog
Actionable strategies on cold email infrastructure, deliverability hacks, and outbound sales growth.
How to Avoid the Spam Folder in 2026
Google and Yahoo changed the rules again. Here is the ultimate guide to ensuring your cold emails land directly in the primary inbox.
Scaling Cold Email: When to add more mailboxes
Sending more than 50 emails a day from a single address is a recipe for disaster. Learn how to scale horizontally using infrastructure.
The Perfect Cold Email Template for B2B SaaS
We analyzed over 10 million outbound campaigns to find out what actually converts. Steal this 3-step sequence.
Why Warmup is Non-Negotiable
Sending from a brand new domain without a peer-to-peer warmup phase is the fastest way to burn your infrastructure.
Spintax 101: Personalizing at Scale
Don't just use first names. Learn how to dynamically spin phrases and entire sentences to trick spam filters into thinking every email is unique.
Microsoft 365 vs Google Workspace
Which email provider has the best native deliverability for outbound sales? The data might surprise you.