Unknown MAPI Error: MAPI_E_INVALID_PARAMETER after webmail login

Bughandle

I always get the error "Unknown MAPI Error: MAPI_E_INVALID_PARAMETER" after login to webmail. After that all webmail functions seem to be available without issues. This only happens to one of my mailboxes. The journal logs do not indicate a problem with the mailbox. The same mailbox also works fine with recent Thunderbird with EWS.

I am a bit puzzled where to continue troubleshooting this?

I am running the latest Grommunio version on Debian 12, but I have observed same problem in earlier version already.

grommunio-admin-api/1.17.60.ma2b3a27-1+19.1
grommunio-admin-common/44.9fd4fb3-1+47.2
grommunio-admin-web/4.0.0.32.fbc7470-1+148.1
grommunio-common/29.6-1+11.1
grommunio-dav/1.6.3.284cd87-1
grommunio-dbconf/1.1.1.da20a46-1+13.2
grommunio-error-pages/1.0.10.bb2df37-1+22.2
grommunio-index/1.3.0.g2bd8a8c-1+15.6
grommunio-sync/2.4.2.579e166-1
grommunio-web/3.16.51.g3de812adc-1+384.1
gromox/3.4.75.me3704a5-1+27.1

Bughandle

After today's release the issue disappeared.

grommunio-admin-api upgraded to 1.18.1.mf744289-1+2.1
grommunio-web upgraded to 3.17.18.g767ba905f-1+390.1

EureGraueKompetenz

Bughandle

I can confirm this.
I had a reimported user who struggled with this Unknown MAPI Error and now it is gone.
Yay.