If you are not sure if your hardware meets the campaign requirements you can run the build in test module. It allows you to run a performance test in order to verify if your hardware can handle the amount of recipients. It will also check the Campaign Settings.
Once the test has finished, you can see the detailed report which will tell you, how many recipients your sever is able to handle within reasonable time frames.
Note: Perfomance Test might take a while, so be patient and avoid using the LUCY server during the test.