I searched the 75xx and I only see T.38 supported. I'm assuming you checked the Administrator Guide (http://download.support.xerox.com/pub/docs/XRIP_WC7525_Fiery/userdocs/any-os/en_GB/sys_admin_guide_u... I would give a call into support or wait until someone with further experience with this feature responds.
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I was wondering has anyone gotten the fax server feature to work using the SMTP option?
I am able to have the email route from the xerox -> email server -> 3rd party fax server but the 3rd party fax server rejects the fax because the email address is not T.37 compliant meaning it does not contain the words "Fax=" in front of the email address.
So if I want to send a fax, and the phone number is 1-800-555-5555, the Xerox printer would email email@example.com. It would not add the words "Fax=" in front of it.
I was reading the WorkCentre 7120 manual (page 120) and it says it has a option to format the email address display so you can add "Fax=" in front of the email address. This option does not exist on the WorkCentre 7535.