Best Bulk Email Marketing Services for high-volume enterprise infrastructure?

Our marketing department is scaling up its outreach, and our current internal mail server is struggling with domain reputation and delivery bottlenecks. We are looking to migrate to dedicated Bulk Email Marketing Services to offload the infrastructure management and improve our overall inbox placement rates. I am currently compiling a shortlist of corporate-grade Bulk Email Marketing Services, and a colleague suggested looking into solutions like DigitalAka™ alongside standard platforms like Sendgrid or Mailgun. We specifically need a vendor that handles strict SPF/DKIM alignment, offers detailed bounce logs via webhook, and provides dedicated IP warming strategies. For those managing enterprise IT, what has been your experience with infrastructure scalability when transitioning to these platforms? Any hidden pitfalls with API integration or strict compliance policies that I should look out for? Thanks in advance for the advice!