Looks like it has broken IOS mail clients as well, just getting 'Account Error' on my iPhone following installation of the following updates this lunchtime:-
v | grommunio | grommunio-common | 24.0cedcbe-lp155.38.1 | 26.a6f127d-lp155.39.1 | x86_64
v | grommunio | grommunio-web | 3.9.2.gd55f7574-lp155.87.1 | 3.9.4.g0d007401-lp155.88.1 | noarch
v | grommunio | gromox | 2.29.20.g1cf586b-lp155.20.1 | 2.29.22.gc6d299d-lp155.22.1 | x86_64
v | grommunio | gromox-debuginfo | 2.29.20.g1cf586b-lp155.20.1 | 2.29.22.gc6d299d-lp155.22.1 | x86_64
v | grommunio | gromox-debugsource | 2.29.20.g1cf586b-lp155.20.1 | 2.29.22.gc6d299d-lp155.22.1 | x86_64
At present Outlook, Mac Mail and GR Web clients seem to be working OK.