I'll build your optimized Mautic marketing automation tool, that can support up to 1 million contacts. I'll tie in your SMTP service (Amazon SES recommended) including bounce management. You also get access to my tutorials and knowledgebase articles. You will have to cover server costs in my highly optimized server park:
Mautic 5K: $25/month, Mautic 20k: $60/month, Mautic 50k: $80/month.