Installing kdepim-runtime would fix this issue.
--
Sughosha
It appears that kmail requires akonadi to provide a few extra Agent Types.
as of kmail 23.04.3 the following are listed as dependencies
* akonadi
* akonadi-contacts
* akonadi-mime
* akonadi-search
installing the following packages enables kmail to start up. The import
& account wizards
guix c3d48d0
~ $ kmail
Connecting to deprecated signal
QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
org.kde.pim.akonadiserver: Starting up the Akonadi Server...
QSqlDatabasePrivate::addDatabase: duplicate connection name
'initConnection', old connection removed.
