Hi RoKox,
Thanks for posting in Apple Support Communities.
It sounds like you set up your new iPad and have signed in to Mail with your email address, but you're not receiving the mail to your iPad. Make sure that mail is being properly delivered to your iPad. Log in to your email server provider's website and check that you have received new emails. If so, remove the email account on your iPad and add it back again using the same login credentials.
Add email accounts
The first time you open the Mail app on your iPad, you may be asked to set up an email account—just follow the onscreen instructions.
To add additional email accounts, do the following:
1. Go to Settings 
> Mail > Accounts > Add Account.
2. Do one of the following:
* Tap an email service—for example, iCloud or Microsoft Exchange—then enter your email account information.
* Tap Other, tap Add Mail Account, then enter your email account information.
Log out of or remove email accounts
1. Go to Settings > Mail > Accounts.
2. Tap the email account you want to remove, then do one of the following:
* If you’re removing an iCloud email account: Tap iCloud, tap iCloud Mail, then turn off "Use on this iPad”.
* If you’re removing another email account: Turn off Mail.
* Note: To remove the email account from all apps on your iPad, tap Delete Account.
Add and remove email accounts on iPad - Apple Support
Regards.
