In Reader Mail: Webmention Spam I mentioned that since I started to send Webmentions post-deployment of this site I happened to be spamming everyone multiple times a day with my Webmentions. I received a few comments from folks about reducing this (or completely stopping it) because some Webmention servers don't de-duplicate sent Webmentions, so a server could see each new Webmention as a new one, and could i.e. send a push notification to the user. Not ideal!