What you are looking for is actually Fax forwarding. And it is included as standard with the embedded fax option.
Server fax is an entirely separate thing from Fax forwarding, this device (4265) doesn't do what you want (Fax forward to SMB). It only can do fax forward to another fax number or an email address. It is done as follows:
Configuring Fax Forward Settings
1. In CentreWare Internet Services, click Properties > Services > Fax.
2. For Forwarding, click the Pencil icon.
3. For Forward To, select an option.
4. For Forward On, select an option.
− On Outgoing: For outgoing faxes, the printer forwards a copy to the fax number or email
addresses specified.
− On Incoming: For incoming faxes, the printer forwards a copy to the fax number or email
addresses specified.
5. If you select On Incoming, to print a local copy, select Print Local Copy.
6. For From Field Options, set the defaults.
7. For Subject, type the text that you want to appear in the subject line of emails sent from the printer.
8. For Message, type the text that you want to appear in the body of emails sent from the printer.
9. For Signature, type the text that you want to appear as the default signature in emails sent from
the printer.
10. Click Save.
The optional Server Fax feature enables users to send documents to one or more fax
machines via the telephone network without having a dedicated telephone line connected
to the machine. This is achieved by connecting the machine to a network Fax Server which
can manage fax transmissions throughout an organization. The Server Fax feature uses
Xerox Partner solutions. Refer to your Xerox Representative for further information.
Server Fax and Embedded Fax
The Embedded Fax and optional Server Fax services are mutually exclusive and only one of
them can be enabled at any time.
If Server Fax is currently enabled and Embedded Fax is then enabled, Server Fax will be
disabled automatically.
If Embedded Fax is currently enabled and Server Fax is then enabled, Embedded Fax will be
disabled automatically.