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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.
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 [2019 Reviews]

This article reviews the top 10 email tracking software in 2019. We cover features, pros, cons, pricing, user ratings and more. Let’s dive in...

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October 23, 2019

Our new “Spam Solver” tweaks your email until it hits the inbox

Stop manually tweaking your email, hoping it will end up in the Inbox instead of Spam. Our "Spam Solver" will tweak it for you until you're happy.

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November 28, 2018

Announcing the launch of the Domain Deliverability Statistics Tool

Get email deliverability statistics and SMTP bounce codes for every domain on the planet.

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August 30, 2018

Resolving “Message not delivered” bounces from Gmail because your “Send mail as” settings are misconfigured

If you’re getting Message not delivered bounces from Gmail indicating that your “Send mail as” settings are misconfigured, here is why it’s …

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August 28, 2018

New Feature: Add a longer delay between emails

For a while, we’ve had an email throttling feature that allows you to add a 5-10 second delay between every sent …

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February 19, 2018

How to use the “Inbox, Spam, or Promotions” email delivery testing tool

This is the guide to my free deliverability tool that tells you whether your email campaigns are making it to the Inbox, Spam, or Promotions folder.

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February 16, 2018

How we optimize email deliverability for non-commercial senders

If you’re sending non-commercial, low-volume emails to an organically developed list, let our Support team know and we can apply …

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January 9, 2018

How to determine the cause of a spam folder or email blocking issue

In this article, I'll teach you two simple steps to determining the cause of spam folder and email blocking issues, and how to resolve the block.

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November 23, 2017

Gmail’s 69585 bounces and what they mean

A Gmail 69585 bounce is a type of block indicating that Google preemptively filtered your email before it ever reached the recipient's server.

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August 3, 2017

How using Gmail’s “Send mail as” settings affects email deliverability

In Gmail you can use the "Send mail as" settings, but this can impact your email deliverability if sent through external SMTP servers.

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