Guide8 min read
The complete guide to Google Sheets mail merge in Gmail
Step-by-step: how to import a Google Sheet into CMass, map columns to merge tags, and send 500 personalized emails in under 10 minutes.
May 20, 2026
The CMass Blog
Guides on cold email, Gmail outreach, deliverability, and making AI work for your campaigns.
Strategy6 min read
How many follow-ups should you send? (And when to stop)
Most people send one follow-up and give up. Here's a practical framework for timing, what to write in each email, and when silence actually means no.
May 14, 2026
AI5 min read
AI personalization in cold email: does it actually work?
There's a lot of skepticism around AI-generated email. Here's an honest look at why it works when done right — and why it falls flat when done wrong.
May 8, 2026
Deliverability7 min read
How to protect your Gmail sender reputation when doing outreach
Bounce rates, spam complaints, and unsubscribe rates all affect deliverability. Here's what to monitor and how CMass helps automatically.
Apr 30, 2026
Comparison10 min read
CMass vs GMass: which Gmail mail merge tool is right for you?
A fair, side-by-side breakdown of features, pricing, and use cases. We built CMass, but we'll be honest about when GMass might be a better fit.
Apr 22, 2026
Compliance9 min read
CAN-SPAM and GDPR for cold email: what you actually need to know
The legal requirements for commercial email aren't as complex as lawyers make them sound. Here's the plain-English breakdown.
Apr 15, 2026
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