Email hook script based on GNOME ones
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The script requires a few git config variables to be set:

* hooks.mailinglist = recipient email-address
* hooks.use-tls = whether to use TLS
* hooks.smtp-host = SMTP host that receives email
* hooks.smtp-port = SMTP port for receiving email
* hooks.smtp-fallback-mail = Fallback hostname for mail addresses
* hooks.smtp-sender = Envelope sender email address
* hooks.smtp-sender-username = Username for SMTP auth
* hooks.smtp-sender-password = Password for SMTP auth