Routing Address - Hybrid Scenario

Hello everyone.

We have a specific user with some SMTP adress problem.

He's a Remote Mailbox user and he only receives emails in his routing address (%@#@domain.mail.onmicrosoft

If I send an email from an external domain in his SMTP primary: user@domain . com, the NDP returns that the outlook didnt find the user.

But, If i send an email from the internal domain in his SMTP Primary, he receives it.

I've been looking ADSI and 365 Exchange options, didnt found anything.

Some ideas?

Remember: only one user has this problem. We have +3000.

Thanks!