I got a shared hosting account with cpanel, and I want to know if catchall will forward even the emails sent to existing email accounts. For example I got and If someone is sending to I should receive it also on using only catchall, is it possible? I don't want to use the forwarding option as it will be displayed to the user with from webmail.
No, it is not possible using catchall. Email sent to existing email account will be delivered to their inbox itself and will only be forwarded of a 'Forwarder' is set.