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Email Source: MBS Books


Known to forward email? no

DMARC Capabilities

Capable of generating DMARC compliant email for others? yes

Capable of signing email with DKIM for others? no

Capable of sending SPF compliant email for others? yes

Notes on Capabilities

DMARC: Our data indicates MBS Books supports DMARC compliance via SPF.

DKIM: Contact MBS to ask about their DKIM capabilities.

SPF: All traffic we've seem comes from '' which translates into an addition of 'ip4:' to your SPF record. In any case, be sure to contact MBS and verify this information before making changes to your SPF.


When deploying DMARC, domain owners often find new sources of email.

Domain owners then wonder if the source is capable of sending DMARC compliant email.

This directory contains information on the capabilities of various sources of email.