This issue is still a problem. Anyone running their MySQL server in strict mode will continually get errors when inserting values into the outbound_email table. This includes sending notifications to people through scheduling a meeting or even changing the administrative settings.

Making people set their server into non-strict mode is NOT OKAY. It is not a solution. I have entered a bug for this issue, though until now I did not know it was related to the strict mode. Please fix this bug ASAP. Defaults should be used any time values are not entered. For the Meetings module, and similar modules, this should be the SYSTEM DEFAULT. For the email settings, this should be regular default values for those fields that are not specified...either table defaults without specifying values in the INSERT statement, or hard-coded defaults from the config file.