Similar experience. Fix with inability to respond to some crazy github-generated email addresses rolled out publicly in less than 48 hours. It helps that I was able to tell them &quot;I am pretty sure it&#x27;s your regex on valid email addresses because I can reproduce it with other emails like $this&quot;<p>I also recall they fixed an issue where &quot;--&quot; at the top of an email I was replying to was making the whole thing look like a signature and when I tried to send it was warning me about an empty message.