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Deliverability

Tips and strategies to ensure your email reaches its destination.

The basics of SPF records

SPF doesn’t refer to how long you can wait before you have to reapply your sunblock (seriously, go get some). Instead, the term “SPF” refers to a security measure that helps...

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Email validation – Why is it vital for your inbox?

We all have those moments when we get nervous and need to double-check ourselves. Did we fill in the right answer bubbles on a test? Did we type in the right password when...

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What is DKIM: Learn how it works and why it’s necessary

Are you who you say you are, or are you a spoofer in disguise? Answering this question is what DKIM is all about. As email usage and capabilities continue to grow, it’s important to...

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What is inbox placement and how is it calculated?

Email deliverability sometimes feels like a mirage. Your messages go on a long journey from your mail server to your subscribers’ inboxes. But it’s the last part of that journey that...

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Email authentication: Your ID card for sending

Email authentication lets mailbox providers know that you’re a trusted sender – that you are who you say you are. As a Technical Account Manager at Mailgun, I’m constantly...

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Email hard bounces: The brick walls of failure

We’ve talked a lot about email bounces and email bounce rates as a whole in the past before, but we’ve really only ever dipped our toes into the different types of bounces...

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What is SMTP relay, how does it work, and why use it?

Remember relay races in school? Just as runners pass along a baton, an SMTP relay passes along an email from one server to another. Sinch Mailgun’s free SMTP relay...

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What is RFC 8058 and what does it have to do with one-click unsubscribe?

Bulk senders have had a lot of questions around what implementing a one-click unsubscribe process means since the requirement was announced by Gmail and Yahoo...

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What is a honeypot, and how does it impact email senders?

The moment Vesper Lynd slinks onto the screen in Casino Royale, you know exactly how this will all play out. Despite being a world-class spy, James Bond will fall hard for the...

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The DMARC perspective: Protecting your sending in the age of stricter enforcement

The world of email is undergoing a significant shift. With Google and Yahoo recently increasing enforcement on DMARC, many organizations are having to implement DMARC...

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