Email Explained

Email Sender Reputation Explained

Here’s what you need to know about your email sender reputation: what it is, how it’s scored, and how to protect it with monitoring and an IP warm-up plan.

Email Message Flow, Sending, and Delivery Explained

Our email pros give a helpful primer on email message flow, from sending to delivery. We help make sense of SMTP, MTA, MX, IMAP, Email API and more.

DMARC Explained

DMARC is a standard for defining email authentication and enforcement. See "DMARC Explained" to learn how it works, record types, policies, and more.

Email Feedback Loop (FBL) Explained

ISPs give key signals via email feedback loops (FBLs). Managing them is crucial to email deliverability. Here are the basics you need to know about FBLs.

CAN-SPAM Explained

The CAN-SPAM law established the United States’ first national regulatory standards for the sending of commercial e-mail. Here’s what you need to know.

Return-Path Explained

Return-Path is a critical header in email messages. Learn what it is and how it works here.

SSL, TLS, and STARTTLS Email Encryption Explained

SSL, TLS, and STARTTLS are important email security protocols. Here’s what you need to know about how these email encryption standards work.

DKIM Explained

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

SPF Explained

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