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:

https://emailmassivo.com/en/blog/deliverability/spf-dkim-dmarc/

Does Authentication Guarantee Inbox Placement?

No.

SPF, DKIM and DMARC are important authentication mechanisms, but inbox placement also depends on factors such as:

• sender reputation;
• recipient engagement;
• mailing-list quality;
• bounce rates;
• spam complaints;
• campaign content;
• sending patterns.

Authentication should therefore be treated as one part of a broader deliverability strategy.

EmailMassivo Marketing Plans

Businesses can start using EmailMassivo with:

Free — $0, up to 500 contacts and 2,000 emails per month.

Premium starts from $14 per month and includes unlimited emails.

Full pricing:

https://emailmassivo.com/pricing/

Campaign Templates

After configuring the technical side of email delivery, businesses can create campaigns using EmailMassivo's email templates:

https://emailmassivo.com/en/templates/

More About EmailMassivo

EmailMassivo combines:

• mailing-list management;
• campaign creation;
• personalization;
• signup forms;
• templates;
• analytics;
• domain configuration;
• API;
• SMTP.

Platform:

https://emailmassivo.com/en/

A detailed overview of EmailMassivo pricing and services is also available here:

https://emailmassivo.com/en/blog/deliverability/emailmassivo-pricing-services/

Correct domain authentication cannot guarantee successful delivery by itself, but it provides an essential technical foundation for legitimate email marketing.