Hi Osman,
no, service activation is not required. I assume that the CRM server does not return proper email address for the current user and therefore the comparion fails and outbound process type is used as default.
Please check email address of the current outlook user. You can do this in gateway client transaction executing follwoing get-request (note that you have to do this with the same user you are using when you do a logon to the backend from outlook):
/sap/opu/odata/CRMGWS/GROUPWARE_SYNC/EmployeeMainCollection?$filter=BelongingTo eq 'Myself'
This should return the employee data of the current user inlcuding email address. Please check if email address contains proper value. If it is empty, this is an indication that you have not maintained a business address for the corresponding employee in CRM backend. Business address is defined as address on the relation of the employee to the corresponding organizational unit (relationship category "Is Employee of".
Regards
Michael