COB Meaning in Email (2026 Guide): Exact Time, Examples & Templates
TL;DR: COB means “Close of Business”, the deadline shorthand for the end of the standard workday, usually 5:00–6:00…
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
Clickable Phone Numbers & Buttons in HTML Email: A Click-to-Call Guide
TL;DR: Relying on image-based buttons can silently ruin your email conversions if an email client blocks images. This…
Animated GIFs in Email: Best Practices Without Killing Deliverability
TL;DR: An animated GIF in an email is a multi-frame image file that plays automatically in most clients.…
Email Deliverability
Shared IP Pools: How a Stranger’s Sending Can Hurt Your Inbox Rate
TL;DR: A shared IP pool is a group of sending addresses your email provider uses for many customers…
Yahoo emails bouncing back: Error codes, causes, and fixes
Yahoo does not bounce mail anonymously. Every rejection and deferral carries a code and a short explanation, and…
SMTP Error 530 5.7.1: Why It Happens and How to Fix It
TL;DR: SMTP error 530 is a permanent refusal rather than a delay: the server will not accept your…
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
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…
Best Warmforge Alternative? 7 Top Tools Ranked (2026)
TL;DR: The best Warmforge alternatives in 2026 are Warmy, MailReach, Instantly, Lemwarm, Warmbox, Warmup Inbox, and Mailivery. Warmy…
Product Updates
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…
Allegrow Alternative 2026: Warmy vs. Allegrow Compared
TL;DR: Warmy.io and Allegrow both help B2B senders reach the inbox, but they solve different parts of the…
Mail-Tester alternative: Warmy vs. Mail-Tester comparison (2026)
TL;DR: Warmy.io and Mail-Tester both help your email reach the inbox, but they solve different problems. Mail-Tester is…
Spam & Blacklists
ivmURI Blacklist: How to check a listing and get your domain delisted
TL;DR: ivmURI is a URI DNSBL operated by Invaluement. It lists domain names, plus a small number of…
Truncate Blacklist: How It Works and How to Remove Your IP
The Truncate Blacklist is a software-based anti-spam system that blocks IPs flagged for sending unsolicited email. Learn how…
Email Domain & IP Blacklist Removal: 5 Steps to Delist and Protect Your Sender Reputation
TL;DR: Removal from every legitimate email blacklist is free, and the process depends entirely on which list flagged…
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