Is cs-cart offering any solution to include mime (text/plain) to sent email`s?
cs-cart sent mail are penalized because are sent - MIME_HTML_ONLY !!
This option can make the difference between spam or inbox.
We do not go through gmail's spam filters (we have dkim, spf, dmarc, we are not blacklisted.) the only thing that penalizes us is the lack off text/plain version.