DKIM Validator

DKIM is a technical standard for email authentication that helps ensure email wasn’t altered in transit. SparkPost’s DKIM Validator is the easiest way to verify your messages have working DKIM signatures.

SPF Inspector

The Sender Policy Framework (SPF) standard lets domain owners define what mail servers and domains are permitted to send email on their behalf. Easily check who’s authorized to send email for your domain with this SPF Inspector from SparkPost.

SPF Builder

Sender Policy Framework (SPF) is an important part of protecting your email sending and brand reputation. SparkPost’s SPF Builder makes it easy to create a working SPF record for your domain.

More Resources for Developers

Along with our email tools, we’ve created a wealth of resources to help developers hit the inbox.

Email Best Practices 101

Email Best Practices 101

This email boot camp will help you to increase the ROI of your email operations with 15 proven tactics for boosting email deliverability.

DKIM Explained

DKIM Explained

DKIM is a technical standard for email authentication that helps ensure email wasn’t altered in transit. Here’s how it works.

DMARC Explained

DMARC Explained

DMARC is a technical standard that allows an organization to define its email authentication practices and how to enforce them. Learn how it works here.

SPF Explained

SPF Explained

SPF is a technical standard for email authentication that defines a domain’s authorized mail servers. Here’s how it works.