[Solved] DKIM validation warning when sending e-mail from Sendgrid API

Question

To set your mind at ease, your setup is fine! Nothing to worry about.

DKIM is, among other things a reputation tool. SendGrid is adding two signatures to your emails, one for your domain, which will help pass DMARC authentication. And one for their domain / service. This second one is optional from the DMARC perspective, but may improve Inbox delivery.

There are many services that operate in a similar fashion, adding an additional DKIM signature to outbound emails.

Accepted Answer

To set your mind at ease, your setup is fine! Nothing to worry about.

DKIM is, among other things a reputation tool. SendGrid is adding two signatures to your emails, one for your domain, which will help pass DMARC authentication. And one for their domain / service. This second one is optional from the DMARC perspective, but may improve Inbox delivery.

There are many services that operate in a similar fashion, adding an additional DKIM signature to outbound emails.