After registration you will be able to try the system 30 days for free. During that period you can send 5.000 emails fo free a try all system features. After this period, the system will automatically offer you the option to continue using the service in a paid form - to choose either Subscription (monthly payments according to the number of contacts in the directory), or Credits (according to the number of sent emails, the validity of the credits is 18 months from the last recharge).
If you decide not to use the system again, you do not have to do anything, your account will remain active and will offer you again the option to switch to a paid service after the next log-in.
By registering and using the free 30-day period you are not required to continue purchasing credits or using subsription.