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No matter how many stars we wish on, some questions will never have simple answers, and one of the most puzzling problems for any email provider is how to prevent emails from...

No matter how good an email design looks, how compelling the copy reads, or how perfectly a campaign renders across email clients... none of it matters if your messages...

Pardon our French, but nothing delivers a bigger sucker punch to your deliverability than a dirty email list. Email lists aren’t just for organizing and storing contacts, they are the...

It's always frustrating  as an email sender when your messages don’t get through. Especially if you don't know why it's happening. In this article, we’ll dig into why Gmail is...

Every time you send an email campaign, ISPs monitor your sending practices and assign a reputation to your domain and IP address. This reputation is based on several factors...

It's a common question that we receive here at Mailgun about SMTP port numbers. To ensure connectivity to our Simple Mail Transfer Protocol (SMTP) endpoint, Mailgun offers...

How’s your reputation? Your email sender reputation, that is. Your sender reputation can be the make-or-break factor for successfully landing in the inbox. It’s a score that an...

The Gmail Promotions tab – some people love it, some people hate it, and some people love to hate it. For many of us email marketers, when we find our witty subject lines and...

There are all sorts of reasons why an email might fail to be delivered and bounce back to the sender (also known as an SMTP Reply). Most of these reasons lie outside of your...

“We’re under attack!” It’s a line that could very well be taken directly from Star Wars or The Matrix, but it’s also a cyber security reality. These attacks are not only sneaky but can be...