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email deliverability

A collection of our articles on email deliverability. We also have several tools to help you test your deliverability like our Inbox, Spam, or Promotions tool.

December 3, 2020

Why Your Emails Go To Spam and How to Solve It

Wondering why your emails are going to spam? Discover the five reasons why and how to avoid spam filters.

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how to resend an email

November 26, 2020

How to Resend an Email (Step-by-Step Guide)

Want to resend an email? This article is a step-by-step guide on how to do it in both Gmail and Outlook.

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email sent from which server

November 23, 2020

From which server are your emails sent?

We’re often asked to provide the IP addresses and domain names of the servers we use to send users’ emails. …

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Gmail direct vs Gmail API

November 13, 2020

Does sending from Gmail directly vs using the Gmail API affect deliverability?

Recently, two email industry colleagues independently reported something odd to me. Each composed an email in Gmail, sent it, and …

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email deliverability

November 6, 2020

What Is Email Deliverability (And How Do You Increase It)?

Curious about email deliverability? This article covers what it is, how to measure and improve it, and the factors affecting it.

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Top 7 email validation tools

November 2, 2020

Top 7 Email Validation API Tools (Features, Pricing, Ratings)

Looking for the best email validation API? Discover 7 powerful email verification API tools with their features, pricing and ratings.

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Blacklisted domain

October 7, 2020

When your Zendesk domain gets blacklisted

If your Zendesk sub-domain gets blacklisted, emails between requesters and agents start going to Spam, and you have a real mess on your hands.

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Proof Google allows sending through SMTP service

September 18, 2020

Proof that Google allows sending from a gmail.com account through an external SMTP server

Ever since we launched the ability to hook your account up to an external SMTP provider and essentially “break” Gmail’s …

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spamhaus list

September 14, 2020

Learning to live with a Spamhaus DBL Listing

Recently Spamhaus listed my primary domain on the DBL. Was it justified? You can decide that, but here are all the consequences of being listed.

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Personalized TO email header

May 30, 2020

Conscientious cold emailers can personalize the “To:” header

Personalizing the "To" header in a cold email campaign probably isn't on your radar, but some think that inserting the first/last name helps deliverability.

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hosted and embedded images in Gmail

April 8, 2020

How to set hosted vs embedded images in Gmail

In most cases when you insert an image into the Gmail Compose window, it inserts as an embedded image. Now YOU can control whether it's hosted or embedded.

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November 5, 2019

Top 10 Email Tracking Software [2020 Reviews]

This article reviews the top 10 email tracking software in 2020. We cover features, pros, cons, pricing, user ratings and more. Let’s dive in...

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