e2euser → created an issue.
I did this on the mandrillapp.com side.
Go to Settings and add a subdomain on the "Tracking & Return Path domain" page
First you have to add a CNAME in your domain, so:
webforms.domain.com CNAME mandrillapp.com
Then test it.
Then go to Outbound - Rules - Add Rule
Fill in a rule name - set to sender's email - matches - webforms.domain.com
then do this: set return-path domain to webforms.domain.com
Is there an indication that CKBOX will be integrated?