Our competitors have been sunsetting email services for at least 5 years, and I don't blame them.
Beyond the troubles of constantly having to upkeep settings, monitor abuse, and deal with getting your IPs off RBLs, AND the stress of seeing other small companies getting shut down by their providers for "ip abuse", there's even more horribleness to deal with. Primarily, the support. Customers will constantly need their hand held to setup their boxes on their phones or laptops, and they won't have any idea how their apps work - but you have to know how they work. And then the oddball "I sent an email to someone's moonmailcow account and it got blocked", and then they need help adding dkim/spf/dmarc, and then they need help setting up a new domain, and then they need help adding a new mailbox, and then they lost their password... It. Never. Ends.
When our competitors started ending email service entirely, we took a middle of the road approach. We still offer "free limited email". The limits are = no support, strict emails per hour/day to prevent abuse, strict storage limits. All these are easy to implement on our dedicated cPanel email server (it's on the c panel email role, so all it can do is email).
When a customer inquired about free email they're recommended to use Cloudflare forwarding (since 99% of them just use Gmail anyways and don't really need a full custom domain email), or if they need support and more features/better limits then they should go to Google Workspaces for professional email.
This works good for us. Maybe 5% of customers use our free email option, 20% use Cloudflare forwarding, the rest use Google or other professional email service.
Sometimes we get a request for support for our no-support email, it's $100/hr.
Email is such a horrid time sink. Not worth it.