When using Gmail,I would like to know if when we mark email as Spam, is it also reported to SpamCop.net or any other related site? 
Are emails marked as Spam in Google Mail reported to SpamCop?
gmail;spam prevention
In Gmail, marking email as spam only marks it as spam for you, not for others.If Google determines a message is spam, it is based on algorithms that match certain tendencies and phrasing that suggest the message is spam. Google doesn't share this information under almost all circumstances.So, no, the message is not reported to outside companies.