To avoid Account Restriction don't share any personal details like Bank account, email etc because all of them are scammers and mostly they are targeting new seller. Fiverr has its payment system so asked them to pay through Fiverr. And if you don't want to get any message, report them as a spammer, or later Fiverr will automatically detect and block them.
Sharing email addresses can lead to a ban or restriction of your account.