Cannot send *.zip attachement to cygwin mailing list

[Jacek Trzmiel]

I've tried to send mail with *.zip attachement to cygwin mailing list,
but got this error:

> Subject: failure notice
>
> Hi. This is the qmail-send program at home.pl.
> I'm afraid I wasn't able to deliver your message to the following addresses.
> This is a permanent error; I've given up. Sorry it didn't work out.
> 
> <cygwin at cygwin dot com>:
> 12.107.209.250 failed after I sent the message.
> Remote host said: 552 we don't accept email with executable content (#5.3.4)

Bug or a feature?  *.tgz attachement with identical contents passed
through:
  http://cygwin.com/ml/cygwin/2004-08/msg00795.html

Regards,
Jacek.

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