Help ensure your emails
hit the inbox
Stop guessing why your messages end up in spam. Follow this 26-point checklist to achieve technical compliance, enhanced sender reputation, and delivery success.
Authentication
Use Own Domain
You should always send email from your own domain rather than a free address, as it looks more professional, builds trust, and gives you full control over authentication and reputation.... [more]
Authentication
rDNS / PTR / HELO
The sending IP address must have correctly configured forward and reverse DNS, with a valid fully qualified domain name (FQDN). The hostname presented in the SMTP HELO / EHLO command... [more]
Authentication
SSL / TLS
All outbound email systems must be configured to support current, industry-standard Transport Layer Security (TLS) protocols when communicating with external mail servers. Secure transmission is a fundamental requirement for protecting... [more]
Authentication
SPF
Sender Policy Framework (SPF) is an email authentication mechanism that enables domain owners to specify which IP addresses, hosts, and third-party services are authorized to send email on their behalf.... [more]
Authentication
DKIM
DomainKeys Identified Mail (DKIM) is an email authentication mechanism that uses cryptographic signatures to verify that outbound messages are legitimately associated with the sending domain and have not been altered... [more]
Authentication
DMARC
Domain-based Message Authentication, Reporting, and Conformance (DMARC) is an email authentication and policy framework that builds upon the results of SPF and DKIM validation. It enables domain owners to define... [more]
Authentication
Dedicated IP
Sending your emails from a dedicated, static IP address is generally recommended once you reach volumes of 50,000 messages per month or more. A dedicated IP allows you to build... [more]