How Your Unsubscribe Link Is Making or Breaking Your Deliverability
New research from Warmy reveals how your unsubscribe link configuration directly impacts inbox placement. See the full data…
Warmy Blog
Turn emails into revenue. Master deliverability, inbox placement, and warm-up strategies to scale outreach while protecting your domain reputation
Email Best Practices
SaaS Email Security: How to Protect Your Business from Modern Email Threats
Email is the lifeblood of modern business – and the favourite hunting ground of cybercriminals. In 2025, more…
How Audio Translator & Voice AI Improve Cold Email Deliverability & Engagement
How many people actually open and read the emails that you send? Getting your email into the inbox…
Email Deliverability
Kit deliverability: Best Practices and Tools
Kit (formerly ConvertKit) email deliverability refers to how reliably your campaigns reach subscribers’ inboxes rather than spam or…
How Does Gmail Decide Inbox Placement Now? (2026 Breakdown)
Your SPF, DKIM, and DMARC all pass. Your delivery rate reads 98 percent. Yet roughly one in six…
Plain text or HTML in cold email?
In this article, we’ll look at plain text vs. HTML, the pros and cons of HTML emails, and…
Email Marketing
Best Practices for Email Subject Lines and 70 Examples
Email subject lines determine whether your message gets opened or ignored. 47% of recipients decide to open an…
What Is a PTR Record and Why It Matters for Email Deliverability
A PTR record (Pointer record) is a DNS entry that maps an IP address to a domain name,…
Plain text or HTML in cold email?
In this article, we’ll look at plain text vs. HTML, the pros and cons of HTML emails, and…
Email Warmup
7 Best Email Warmup Tools for Improving Sender Reputation (2026)
Compare the best email warmup tools for building and protecting sender reputation. Learn what separates effective tools, what…
Email Deliverability Tools with Customizable Warmup Schedules: The 2026 Expert Guide
Compare top email deliverability tools with customizable warmup schedules. Learn which features matter and find the best solution…
Best Warmup Solutions for High-Volume Email Senders: What You Need to Know in 2026
Key takeaways High-volume email warmup requires SPF, DKIM, and DMARC authentication, a clean list, and a dedicated sending…
Product Updates
Seed List for Microsoft 365: Why Email Marketers Need It in 2026
A Microsoft 365 seed list is a curated set of genuine Microsoft 365 mailboxes that receive your campaign…
Warmy API: New Endpoints for Mailbox Headers, Warmup Statistics, and Domain Monitoring
We’ve released a new set of API v2 endpoints that give developers and technical users significantly more control…
Adeline AI Chat: Get Instant Insights from Your Warmy Email Deliverability AI Assistant 24/7
Adeline is Warmy’s built-in AI email assistant, now live inside every user account. In a nutshell, Adeline AI…
Spam & Blacklists
What Is the Spamhaus Blacklist and What Does It Do to Your Email Deliverability?
Spamhaus can kill your email deliverability overnight. Warmy's 2026 research breaks down every list, what triggers them, and…
SURBL Blacklist: What Is It, Why You Get Listed, and How to Fix It
This SURBL blacklist report by Warmy.io discusses what triggers a SURBL listing, how to check your domain, and…
The Barracuda Reputation Block List: What Every B2B Email Sender Must Know
The Warmy Research Team breaks down how the Barracuda Reputation Block List works, what triggers an IP listing,…
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