Black Friday Email Warm-Up: A 5-Week Schedule to Protect Your Sender Reputation
Five weeks before the sale, start your Black Friday email warm-up. Increase send volumes by 25-50% each time,…
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
Sent an Email With a Typo? How to Decide Whether to Correct It
It’s sent. Two seconds later, there it is: the typo. When you spot a typo in email that…
Email Footer Best Practices: What to Include and What Hurts Deliverability
It is easy to ignore until something goes wrong. But once you need to know which company sent…
Email Deliverability
HELO/EHLO and Sender Reputation: The SMTP Handshake Explained
Before a single word of your email is read, your server has already introduced itself. The SMTP HELO…
SMTP Ports Explained: 25, 465, 587, and Which One to Use
Short answer: to send from an app, CRM, or email client, use SMTP port 587 with STARTTLS, or…
Email Footer Best Practices: What to Include and What Hurts Deliverability
It is easy to ignore until something goes wrong. But once you need to know which company sent…
Email Marketing
Email Template Size Guide: Ideal Width, Height & Dimensions (2026)
What's the ideal email template size? Get exact pixel, inch & cm specs for headers, banners, images &…
Is Your Email Being Read? Here’s How to See If Someone Read Your Email
TL;DR: You can no longer trust open rates alone to know if someone read your email. Apple Mail…
Best Email Marketing Tools: 12 Picks by Category (2026)
TL;DR: Email marketing tools split into four categories that work together: ESPs to send, deliverability and warm-up to…
Email Warmup
Domain Checker: What a Full Domain Health Check Should Include
Look at the pages that rank for domain check, and you will see that they answer a narrow…
Best Cold Email Software with Built-in Warm-Up: 8 Tools Compared
TL;DR: Cold email software with built-in warm-up refers to sending platforms that bundle an automated reputation-building process with…
6 Best Lemwarm Alternatives for Email Warm-Up (2026)
TL;DR: Lemwarm works well enough while Lemlist is your sending platform. Two things push teams to switch: it…
Product Updates
Validity’s Heatwave Blocklist: What We Know So Far About Its Impact on Email Deliverability
The Validity Heatwave blocklist launched on September 3, 2026, to identify sending domains associated with synthetic reputation warming…
Google Postmaster Retired Domain Reputation. Warmy Is Building Its Own
For years, the Domain Reputation chart in Google Postmaster Tools was the first thing many senders checked. One…
Adeline AI: How Warmy’s AI Warm-Up Engine Works (2026)
Adeline is Warmy’s built-in AI email assistant, now live inside every user account. In a nutshell, Adeline AI…
Spam & Blacklists
Free IP & Domain Blacklist Checker: Check Blacklist Status, Reputation & Reverse DNS
IP block list checker for IP addresses and domains against blacklists – search for an address in spam…
URL Phishing in Emails: How to Detect and Prevent Malicious Links
TL;DR: Phishing links use deceptive URLs and lookalike domains to steal credentials, though you can spot them by…
RATS-NoPtr blacklist: Why your IP got listed and how to get delisted
TL;DR: Blacklist checkers report the SpamRATS name without saying which of the four zones fired, so check the…
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