Finding Owner Object Properties in Validation Script

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So I managed to work this one out:

Option Explicit

' get property values of the owner object
Dim oPropVals : Set oPropVals = Vault.ObjectPropertyOperations.GetProperties (ObjVer,False)

Dim email, domain, owner, ownerDomain, extractDomain, ownerObj
' this is the email address that we're checking
email = PropertyValue.GetValueAsUnlocalizedText

' this is the owner object, in our case "1049" is Owner (Customer)
owner = oPropVals.SearchForProperty(1049).TypedValue.GetValueAsLookup.Item


Dim objID
Set objID = CreateObject("MFilesAPI.ObjID")
' 106 is the ID of the 'client' object type, which holds the domain allowed for all employees of this customer
Call objID.SetIDs( 106,  owner)
Set ownerObj = Vault.ObjectOperations.GetLatestObjVer( objID, false, false )

' get the property values belonging to this contact person's employer (customer)
Dim oOwnerPropVals: Set oOwnerPropVals = Vault.ObjectPropertyOperations.GetProperties (ownerObj,False)
' get the email domain property for the customer
domain = oOwnerPropVals.SearchForProperty(1113).TypedValue.Value

'extract domains for comparison, the persons domain is taken as all characters to the right of the first '@'
extractDomain = right(email, Len(email) - InStr(email, "@"))

' only allow proceeding if this person's domain matches the customer domain
IF (domain <> extractDomain) THEN
	Err.Raise MFScriptCancel, "To ensure data security customer email addresses must match customer domain." + vbNewLine + "Customer Domain: " + domain + vbNewLine + "Email Address Domain: " + extractDomain
END IF

The short version though is that every new object type you create will have an associated built-in property called Owner (OBJECT NAME). The variable you are performing validation on will have this property, which then lets you get to the actual owner object itself, grab it's properties, and then you can do what you want!