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Email Deliverability

Email deliverability is essential for anybody and everybody who's using email to send important messages — whether you're sending cold emails to thousands of prospective clients or sending a birthday invitation to a dozen friends.

If your emails don't wind up in your recipients' inboxes — and instead go to the Gmail promotions tab or, worse, the spam folder — your chances of campaign success plummet.

Here in the email deliverability archives, you can read the articles we've written on deliverability and avoiding spam.

You can also learn about many of the tools GMass has developed to help you improve deliverability like the Spam Solver, Email Deliverability Wizard, Email Warmup Tool, Domain Statistics roundup, Email Tester, and more.
how to resend an email

November 26, 2020

How to Resend an Email in Gmail & Outlook (w/ Screenshots)

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

Life on the Spamhaus DBL

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 Tracker Software (Features, Pros, Cons, Pricing)

This article looks at the top ten email tracking software available today. We'll go through features, benefits, drawbacks, pricing, user reviews, and more.

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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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