Sets whether mail sources within the collection should be enabled.
An ECollectionBackend running within the registry D-Bus service will automatically synchronize any mail sources it maintains
with the mail_enabled property.
Calling this function from a registry service client has no effect until the changes is submitted to the registry service through write, but there should rarely be any need for clients to call this.
| this | |
| mail_enabled |
whether mail sources should be enabled |