[TCLCORE] Mail to webmaster@tcl-lang.org failing

[Colin M. <col...@ya...>]

A Reddit user reported this problem at 
https://old.reddit.com/r/Tcl/comments/1q3zz42/email_to_webmastertcllangorg_not_deliverable/. 
I tried a test email myself just now to web...@tc... and it 
also bounced:

    Sorry, we were unable to deliver your message to the following address.

    <web...@tc...>:
    521: 5.3.0 Upstream error, please check
    https://developers.cloudflare.com/email-routing/postmaster for
    possible reasons why. ye6dCEJkeEy2

The web page https://www.tcl-lang.org/ gives web...@tc... as a 
contact point, so this should work.  I don't know who has access to 
investigate and fix this.

Colin.