Mass email mailouts

We have significant data and need to send out personalised emails to the data.

We have used mailchimp and constant contact but it keeps returning with spam notification so needs a different solution and someone who can implement. Sending to the UK market.

We need a two or three step personalised email sent out in mass. Data is about 100,000.

We would like to automate with hubspot and would rather not use our domain if it is going to bounce back.