When mapping Mail or UPN to an extension attribute the domain suffix will be adjusted to look for the target domain suffix. If the values are the same for Mail on the source object and Extension Attribute on the target the match will fail.
In the case where Contoso.com is the source and Fabrikam.com is the target domain then the following would be an example of a working mapping.
Source Mail Attribute: user1@contoso.com
Target ExtensionAttribute14: user1@fabrikam.com
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