Best practice to send reports via external email (SSRS, CRM or other)

We want to start sending out emails to our customers that have tracking information attached. I've done this internally with a data driven subscription but I'm sure that isn't an industry best practice for sending externally. I know this could cause some issues with spam filtering, etc... How have you handled this before? We wouldn't be sending more than 30-50 per day initially, but as the business grows so will those numbers. I'm sure there's a service where we send the data and they would send on our behalf, but I'm pretty unfamiliar with how this is done industry wide. Do people use their CRM's marketing platforms to take care of something like this?