Email Auth

Also listed on wordpress.org.

Email Auth allows you to enable email authentication/validation for your WordPress site. Configure the DKIM selector, SPF, DMARC, bounce address, from address, and reply-to address of emails sent by WordPress through the default PHPMailer. Configuring these email settings allows you to prevent attackers from spoofing emails from your domain and helps keep your emails out of the spam folder.

DKIM Selector

Create, upload, download, and delete private and public keys for use with DKIM with an intuitive interface. Configure emails to use a DKIM selector and configure which domain should be used with DKIM.

SPF

Create a new SPF record for your envelope domain, validate an existing record, or view recommendations for how to improve your SPF configuration.

DMARC

Validate your DMARC DNS record settings and view comments about your current configuration.

Bounce Address

Set your bounce address to ensure emails are being sent from the right domain to avoid having your emails rejected or marked as spam.

From Address and Reply-To Address

Set the address and name emails are sent from along with the address replies should be sent to.