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The <StripPfx> element strips off the prefix of an attribute before it is used in the construction of an email address. It controls the <Canonical> variable binding step. Each <StripPfx> element contains one <Attribute> and one <Prefix> sub-element.
sub-element: Attribute
The <Attribute> sub-element names an LDAP attribute to transform.
sub-element: Prefix
The <Prefix> element contains the prefix to strip off.
When trying to bind a <Canonical> variable that contains a reference to <Attribute>, if the value of that <Attribute> begins with the <Prefix> text, that text is stripped before substitution is done in the <Canonical> element. If the <Attribute> value does not match the <Prefix>, then that attribute value cannot be used to replace the reference in the <Canonical> element.
ActiveDirectory is the only server type with a default for <StripPfx>:
<StripPfx>
<Attribute>proxyAddresses</Attribute>
<Prefix>smtp:</Prefix>
</StripPfx>
The special checks for attribute prefixes defined by <StripPfx> elements are also applied when performing enumerations.