Globally for all events: wrapper.event.default.email.smtp.auth.password property, or
For a specific event: wrapper.event.<event_name>.email.smtp.auth.password property.
The "<event_name>" component of the property name can be
either the keyword "default",
or one of the Event Types.
By setting the default property,
all Event Types which are not set explicitly will take on that value.
When any property is read in from the configuration file, the '#' character is treated as a comment such that the rest of the line is ignored.
If your password contains a '#' character, you will need to double it up so the character is escaped correctly '##'.
Please see the overview of Event Mails for the usage examples.