According to this post back in 2016 from @Olivia_Rust eM Client does support Zimbra using IMAP and may also now work with EWS.
Have you tried the automatic setup wizard? If you have, where did you get up to ?
According to this post back in 2016 from @Olivia_Rust eM Client does support Zimbra using IMAP and may also now work with EWS.
Have you tried the automatic setup wizard? If you have, where did you get up to ?