Email & Deliverability

Guides for SMTP, SPF, DKIM, DMARC, MX and rDNS, written to strengthen domain authentication and keep legitimate mail out of the spam folder.

Whether an email reaches the inbox depends less on its content than on the identity of the sending server. Receiving servers check the SPF, DKIM and DMARC records on every message; if one is missing, the message lands in spam or is rejected outright. Form and order notifications sent by your website follow the same rules.

The SPF, DKIM and DMARC guide explains what each record does and in which order to set them up. Sending mail over SMTP with PHP shows why authenticated SMTP beats the mail() function and lists the SMTP settings of WordPress, OpenCart and other popular applications.

For mailboxes on your own domain see our business email plans, and for bulk sending the SMTP sending plans; the DNS records you need are listed in the client area.