why "Sorry, your message has been denied due to keywords found in your subject"?

[Daniel Barclay <daniel@xxxxxxx>]

> <cygwin@xxxxxxxxxx>:
> Sorry, your message has been denied due to keywords found in your
> subject.  This is probably due to an off-topic post.
> ...
> --- Enclosed are the original headers of the message.
...> Subject: widely-spaced characters in rxvt (non-X11 mode)

What the heck is off-topic about rxvt and X11?


Daniel






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