Running your own email server isn't that complicated...running OTHER people's is. I worked for a company that had a few custom email servers running Postfix and

Running your own email server isn't that complicated...running OTHER people's is. I worked for a company that had a few custom email servers running Postfix and Dovecot. Charged them very little for an inbox which make it incredible hard to offload them to others. The company that ran the datacenter for our email servers went out of business, migrating 10,000+ inboxes that haven't been cleaned in 15 years was an absolute nightmare. I don't wish it on anyone.