mail_dkim_privatekeystring

Name: DKIM Private key string Type: String Default: (empty)

The private key used to sign outgoing mail, supplied as a string instead of a file path. It takes precedence over mail_dkim_privatekeyfile.

Use this when the key cannot be stored as a file on the server. The key is stored in the database and visible in System Settings to anyone with the relevant permission. Prefer the file option on shared installations.

The value is passed to PHPMailer by core/src/Revolution/Mail/modMail.php.