Open Incognito/Private browser window.
Use https://www.mohmal.com/en/inbox (Click mail to copy, click change to get a new one)
Use referral link, create account.
You can put nonsense for name (asdfgdfgf). Put whatever for Age confirmation, you'll get a second prompt for age confirmation, but they don't need to match. You don't need to confirm email. Just logout and paste referral link again. Repeat.
You can just do it by yourself.
Open a new "incognito/private" browser window.
Use something like https://www.mohmal.com/en/inbox (Click email to copy it, click change to get a new email).
Use your referral link to create an account. You can type nonsense for names. You'll get a second age confirmation, that doesn't need to match, just put whatever. And done.
Logout and use your referral link again.
You don't need to confirm the account or anything. Once you get the hang of it, you can go through all 25 in less than 30 min.