Comment 5 for bug 1937880

Still got
  <email address hidden>: host mx.ubuntu.com[185.125.188.73] said: 550 5.1.1
    <email address hidden>: Recipient address rejected: User unknown in relay
    recipient table (in reply to RCPT TO command)

Right now (and a few times yesterday) the search page was slow or gave 500.

https://httpd.apache.org/docs/2.4/custom-error.html lists several methods to change the error text for 500. Maybe .htaccess for this is enabled? Is there a administrator that this should be forwarded to?

If only the email address can be changed, maybe using
   <email address hidden>
as email address would be a cludge in the meantime.