Ip address box of free and commercial

Ip address box of free and commercial

Hello
I have a question.
Is free domain account, use the same ip address as mailbox commercial?
I mean for a last widespread situations blocking your ip on spam lists and lack the ability to send e-mails.
You have only one IP address for all e-mail users zoho?
At the moment you can not work normally because the majority of the mail is rejected.
If after upgrading to the paid version box "Standard 10GB" the situation is identical to your website it is frivolous.
Regards