Which of these two sentences sounds better to you:
You have now access to your new email account.
You now have access to your new email account.
Thanks a lot,
TOEIC listening, photographs: Out for a walk[YSaerTTEW443543]
Definitely the second sentence.
But if the word access were used as a verb, this placement of now (as in the first sentence) would be OK:
You can now access your new email account.
The first sentence is definite Germlish, Torsten. (Or Czenglish or Polish English.)