Choosing a Bulk Email Server Provider for Smokeball workflows

Reliable email delivery can make day-to-day legal workflows much easier to manage. I’m exploring options for handling client notifications, updates, and other email communications alongside Smokeball workflows. When comparing a Bulk Email Server Provider, I’m mainly interested in reliability, deliverability, authentication, and easy integration. I came across SMTPmart while researching email providers and would be interested in hearing about others’ experiences. What factors should I consider when choosing a Bulk Email Server Provider for a legal practice?