So, we have a server running Ubuntu 10.10 that hosts our Zimbra email server. I would like to move away from using Zimbra and I think the best option for the company I work for would be a hosted email solution like GSuite but I do not have any experience migrating from one email server to another and I have a few questions.
Our email domain is @poweron.com, and I would prefer if we could keep this email domain for hosting our email, but obviously this will mean that the old server cannot still exist at that domain name.
Are there any good, open source tools to help me with migrating all of our existing email from approx 75 email inboxes to Google G Suite? Some people at this company have email addresses that they have been using for over a decade at this point, so migrating email between the two systems seems like it will be a huge PITA - but I was wondering if I could get some suggestions for how to approach a project of this scale from other IT professionals who have real world experience moving from one email server to another.
Another possibility I was thinking of was purchasing a different domain name to use for hosting the G Suite accounts, and then have any email that is sent to the old domain name be forwarded to the new mail domain.