ColdStack Blog
Insights, tips, and best practices for modern sales teams
How I sent 11,700 emails and got $133,788 in leads (+email copy)
A complete breakdown of the 40/40/20 framework that generated $133,788 in pipeline from 11,700 emails, with exact templates and strategies.
Common Inbox Placement Issues and How to Fix Them
Fix inbox placement by improving sender reputation, configuring SPF/DKIM/DMARC, boosting recipient engagement, and using testing and monitoring tools.
How to A/B Test Cold Emails for Better Reply Rates
Test one element at a time—subject lines, email copy, or CTAs—to measurably boost cold email reply rates with clear goals, proper sample sizes, and significance checks.
80 Cold Email Subject Lines That Get Opens in 2025
80 mobile-first cold email subject lines and templates organized by strategy—personalization, curiosity, urgency, and action-focused lines to boost open rates.
Don't Tank Your Deliverability: How to Check if an Email is Valid First
Prevent bounces and protect sender reputation by validating emails: syntax, domain and mailbox checks, bulk tools, CRM integrations, and ongoing list hygiene.
How to Launch Your Go to Market Strategy with Cold Email
Guide to launching a go-to-market with cold email: define your ICP, write concise personalized messages, automate follow-ups, improve deliverability, and track results.
Go to Market with Cold Email: The Complete Outbound Playbook for 2025
A practical playbook for cold email in 2025: write persuasive outreach, stay compliant, protect deliverability, and scale outbound operations.
Cold Email Spam Checker
Check your cold email for spam triggers with our free grader. Get a spam risk score and rewrite tips to land in the inbox, not junk!