Notification mail templates use embedded images hosted at matrix.org and vector.im #2359
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Description
This issue has been migrated from #2359.
This is not a duplicate of #1809 or #1811.
The templates used to send notification mails use hardcoded image links to matrix.org/vector.im here:
https://github.com/matrix-org/synapse/blob/master/res/templates/notif_mail.html#L22-L26
https://github.com/matrix-org/synapse/blob/master/res/templates/notif.html#L9-L13
To respect privacy of my users I changed the templates, but it would be nice if those resources are delivered by synapse itself (like the avatar images in the notification mails) or are configurable or in other means update safe.