Well, I think I've cracked it - after a few weeks of on-and-off work on making my webmention sending not spam everyone (see https://www.jvt.me/posts/2019/10/30/reader-mail-webmention-spam/ ) - it's now not re-sending them if they're successful. This is a good first step, but I'll be improving it to re-send if the post's data has changed since last time it tried (in the future).
Note that this isn't quite done yet, expect it to be live tomorrow perhaps.
This was published using https://micropublish.net.
This post was filed under notes.