On a freshly installed Debian testing with KDE desktop, i set up KMail to read email from our corporate MS Exchange server using the IMAP protocol.
The curiosity in me wanted to check out GSSAPI for authentication, but the IMAP server replied with SASL(-4): no mechanism available: no worthy mechs found.
Of course, I need the krb5-user package and run the kinit command to retrieve a valid Kerberos session ticket. What wasn’t so obvious was the need for the package libsasl2-modules-gssapi-mit. Voila! Got me some emails