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Email Deliverability Benchmarks for Recruitment & HR

Email is a critical communication tool for recruitment and HR teams—whether you’re contacting candidates, following up on job offers or sending internal communications to your employees. But if your emails

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SMTP Error 451 – How to Resolve [SOLVED]

Learn why SMTP Error 451 occurs and how to resolve this issue. Explore how Warmy.io can help prevent this issue
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SMTP vs API Sending: What a Year of Google Sending Data Reveals

Does SMTP vs API sending affect email deliverability? The Warmy Research Team used one year worth of data to answer
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Automate Like a Pro: How Cold Email Sequencers Boost ROI

Cold emailing delivers, so it’s no surprise that it’s a common element in most outbound marketing strategies. Especially because you

A graphic with the text Cold Email Sequences: What They Are and How to Create One That Converts. A partial list of email sequence steps and statistics appears on the right side.

Cold Email Sequences: What They Are and How to Create One That Converts

Cold email is very much an integral part of any sales and marketing strategy this 2025. Despite the growing influence

A digital graphic with the text Mailbox Calculator Explained: What It Is and Why Email Marketers Use It beside a form asking about the number of emails to send per day and per mailbox.

Mailbox Calculator Explained: What It Is and Why Email Marketers Use It

For email marketers, here’s a common dilemma: Finding the balance between sending just the right amount of emails to engage

An illustrated tiger in a black warmy shirt stands with crossed arms next to the text: Email Deliverability Demystified: A Simple Guide for Startups & Solo Founders. Orange grid lines are in the top right corner.

Email Deliverability Demystified: A Simple Guide for Startups & Solo Founders

Whether sending cold emails to generate leads, newsletters to engage your audience, or outreach to potential investors—email deliverability is critical

A muscular tiger character in a Warmy t-shirt stands with crossed arms next to text that reads: “How Many Mailboxes Do You Really Need for Email Outreach?”.

How Many Mailboxes Do You Really Need for Email Outreach?

With all the focus on content, subject lines, and targeting, it seems that we usually overlook the role that your

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Why Your Cold Email Strategy Needs a Mailbox Calculator (and How to Use One)

Cold email outreach is not just about writing the perfect message—it’s about the “machine” behind that message. The most common

Illustration of an anthropomorphic tiger wearing a black warmy t-shirt, standing with arms crossed next to the text: Is Your Cold Email Template Getting You Marked as Spam? on a white background.

Is Your Cold Email Template Getting You Marked as Spam?

When it comes to cold outreach, many marketers and sales teams focus on the quality of the email list. But,

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From Spam Folder to Inbox: Mastering Email Deliverability Basics

It can be really frustrating when you realize your emails are being reported as spam. Because no matter how hard

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Signature Showdown: Crafting the Perfect Email Signature for Maximum Deliverability

In a world where email marketers compete for open rates, click-through rates, and conversions, the email signature may easily be

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Email Deliverability Testing 101: Tools, Metrics & What You Should Be Looking For

The success of your email marketing efforts depends a great deal on your email deliverability. No matter how strong your

A graphic featuring an illustrated tiger wearing a black warmy shirt, standing with arms crossed next to the text: The Anatomy of a High-Performing Cold Email (Template Included).

The Anatomy of a High-Performing Cold Email

Learning how to implement cold email outreach is imperative for any person in marketing, sales, or any entrepreneur who wants

An illustrated tiger wearing a black Warmy shirt stands with arms crossed next to the text Mailbox Math: How to Optimize Sending Volume Without Hurting Deliverability. Orange grid lines are in the top right corner.

Mailbox Math How to Optimize Sending Volume Without Hurting Deliverability

The truth is, that most of the people that get into marketing are not big math lovers. Numbers, formulas, and

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