Ask HN: Self Hosted Webmail Client

I am looking to self host emails for a small non profit organization. MX plans are cheap when buying a domain name but come with poor webmail like Roundcube[0] which really feels outdated when compared with Gmail or Fastmail. I am looking to self host a full featured modern webmail client but can’t find any. Why ?

Soho[1] is the best I have found and supported by Gandi[2].

[0] https://github.com/roundcube/roundcubemail [1] https://github.com/inverse-inc/sogo [2] https://webmail.gandi.net/SOGo/