I compiled SOGo 5.9.1 from source on AlmaLinux9 which worked fine. I also compiled ytnef from source, because I keep getting the errors:
Error (objc-load):/usr/local/lib64/GNUstep/SOGo/Mailer.SOGo/Mailer: undefined symbol: TNEFParseMemory Error (objc-load):/usr/local/lib64/GNUstep/SOGo/MailPartViewers.SOGo/MailPartViewers: undefined symbol: __objc_class_name_SOGoMailBodyPart Error (objc-load):/usr/local/lib64/GNUstep/SOGo/PreferencesUI.SOGo/PreferencesUI: undefined symbol: __objc_class_name_SOGoMailLabel So somehow ytnef is not getting bundled. I tried to add it to BUNDLE_LIBS "-lytnef" in SoObjects/Mailer/GNUmakefile.preamble but it didn't work.