In my gmail account I connected 4/5 external email account and every time I receive a new message on an email address I get a notification on my smartphone.

I'm trying to do the same thing on zoho mail and until now I connected only one external email account but when I receive a new message I don't receive any notification. Moreover in Mail iOS app I can't see the external email.

Is there some particular configuration that I have to do?

Thank you