What should businesses check before choosing a dedicated SMTP server?

[varunrastogi]

What should businesses check before choosing a dedicated SMTP server? I’d like to understand the most important factors, such as email deliverability, server reliability, IP reputation, scalability, security, authentication (SPF, DKIM, and DMARC), technical support, and overall cost. What should a business prioritize to ensure reliable and successful high-volume email delivery?