I don’t understand the IP location criticism at all. At least for my experience across Europe all locations that are being reported by the common databases are within 250km of the actual customer.
Am I the only one who thinks that this post-mortem for a margin of email users worldwide is a pure marketing gimmick to attract more "technical" users?
My main reason to move from Mail-in-a-Box[1] to AWS WorkMail[2] to finally Microsoft Office 365[3] was that there is no other implementation which supports all MS Outlook features like native MS Exchange.
Are there any (Self-Hosted?) alternatives nowadays?