As far as i know 000webhost ask you to point your domain name to theyr nameservers. If this step is made you can add your email accounts , subdomains and anything you may want. I personaly have 2 websites at 000webhost since i develop some php scripts to work on highly restricted platforms and i have 1 mail for each of those domains. Anything works perfect 2 minutes in 1 day with emails since 000webhost tryes to make free members to buy paid plan so they made some services to die few days in 1 day.
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