Joshua Watt <jpewhacker@xxxxxxxxx> writes: > It can be necessary to disable SMTP authentication by a mechanism other > than sendemail.smtpuser being undefined. For example, if the user has > sendemail.smtpuser set globally but wants to disable authentication > locally in one repository. I wonder if it would be more productive to introduce a mechanism that can be used to address that use case more directly. For example, would it help to teach "git send-email" that sendemail.smtpuser set to a particular value (say '!', or empty string if you prefer) is equivalent to the variable unset at all?