@janboddez I checked the code and when we get an ActivityPub reply, we do send webmentions if there's a post in the thread that is from a blog. (We don't send webmentions if it's just a pure-Mastodon thread.) You do have a Micro.blog account that's hooked up to your blog posts. In other words, it's working correctly. 🙂 Solutions: de-duplicate in your blog when receiving a webmention, or remove your blog feed from Micro.blog. Email help if you have any login questions.