guide·2 min read
What Happened to GMass's Email Warmup Tool?
GMass shut down its free email warmup system on January 31, 2023 after Google threatened its Gmail API access. Why it ended and which tools still include warmup.
Cold Outreach News & Guides
Tool launches, pricing changes, sender-requirement updates, and outbound playbooks.
guide·3 min read
Did Google Remove Domain Reputation from Postmaster Tools?
Google planned to retire the Domain and IP Reputation dashboards with Postmaster Tools v1 on September 30, 2025, then postponed it. What is live now and what v2 drops.
news·6 min read
Which SPF Mistakes Hurt Cold Email Deliverability?
A mailtester.com deep-dive reveals how wrong sender domains, syntax errors, and DNS lookup overflows silently push cold emails into spam, and how to fix them this week.
news·5 min read
What Are lemlist Signal Agents, and Do They Replace Clay?
lemlist's Signal Agents monitor buying signals and auto-enrich leads inside the sending tool, cutting out Clay and Zapier trigger workflows for cold email operators.
guide·2 min read
Is Gmail's Verified Sender Program Open to Cold Emailers?
No. Gmail's Verified Sender Program is for US political committees. What it requires, why cold emailers cannot enroll, and which Gmail rules apply to them instead.
news·6 min read
What Are Yahoo's Bulk Sender Requirements in 2026?
Yahoo's bulk sender rules as they stand in 2026: authentication, the 0.3% spam rate, one-click unsubscribe, and how they compare to Google and Microsoft.
news·5 min read
What Does Apollo's AI Research Feature Actually Do?
Apollo rolled out AI-powered prospect research inside its platform. What it actually does, where it falls short, and whether it shifts the Instantly vs Apollo debate.
guide·3 min read
What Is a Good Cold Email Reply Rate in 2026?
A good cold email reply rate is 5% to 10%. Sourced 2026 benchmarks for reply, open, bounce and spam rates from four large datasets, and what moves them.
news·5 min read
Can ChatGPT Run Instantly.ai Campaigns?
Instantly.ai has launched a native ChatGPT integration letting operators create campaigns, manage leads, update sequences, and pull analytics via prompt.
news·6 min read
What Are Outlook's Bulk Sender Requirements for Cold Email?
Microsoft Outlook now enforces SPF, DKIM, and DMARC for senders at 5,000+ emails/day. Here's what cold email operators need to audit before enforcement hits.
teardown·2 min read
How Do You Test a Cold Email Tool's Deliverability Claims?
Every cold email tool claims great deliverability. Here is the checklist we run on those claims: warmup, rotation, ESP matching, and the numbers vendors avoid.
guide·2 min read
How Much Does Cold Email Cost Per Month in 2026?
The sending platform is the cheapest line item in a cold email budget. Here is the full stack cost: domains, mailboxes, data, and tools, priced for three team sizes.