Email deliverability is not determined only by the content of an email.

Mailbox providers also evaluate the identity and technical configuration of the sender.

EmailMassivo supports sender-domain configuration and provides guidance for important authentication mechanisms including SPF and DKIM.

SPF

SPF stands for Sender Policy Framework.

It allows a domain owner to specify which mail servers are authorized to send messages on behalf of that domain.

DKIM

DKIM stands for DomainKeys Identified Mail.

It uses cryptographic signatures that allow receiving systems to verify that an email is associated with the sending domain and has not been modified after signing.

DMARC

DMARC builds on SPF and DKIM and allows a domain owner to publish rules describing how authentication failures should be handled.

EmailMassivo has published a full explanation here:

... Читать дальше »