/schemas/apps/evolution/eplugin/email_custom_header/customHeader /apps/evolution/eplugin/email_custom_header/customHeader evolution-eplugin list string [Security=Personal;Unclassified;Protected;InConfidence;Secret;Topsecret] List of Custom Headers The key specifies the list of custom headers that you can add to an outgoing message. The format for specifying a Header and Header value is: Name of the custom header followed by "=" and the values separated by ";"