Hello,
The error that you are getting "smtp 553 envelope sender rejected" seems to be directly related to the configuration of your smtp and outside the scope of BPC.
I have checked all of our reported cases for BPC and other components and didn't find this reported previously. However, if you search online you will find this error posted on various help sites and Wiki's. I found some information on this >link that could be help you get started. I hope this helps.
Best Regards,
Leila