Sentori supports full DMARC compliance.
For DKIM setup, visit: http://docs.sentoriapp.com/own-domain-sending
Apart from 'include:mail.snt0.net', Sentori also readily provides individual netblocks in order to avoid unnecessary DNS-querying mechanisms in your SPF. For more information and SPF setup, visit: http://docs.sentoriapp.com/own-domain-sending