This is a teaser for a real blog post : https://buttondown.com/blog/x400-vs-smtp-email https://buttondown.com/blog/x400-vs-smtp-email the URL should probably b

This is a teaser for a real blog post : https://buttondown.com/blog/x400-vs-smtp-email https://buttondown.com/blog/x400-vs-smtp-email the URL should probably be updated to it?