email addresses: @-sign needed

[Brendan McKay]

* N. J. A. Sloane <njas at research.att.com> [030419 20:34]:
> 
> Afterr thinking about the problem some more,
> it seems to me that the simplest solution of all
> would be the best:
> 
> just replace joe at broken.hill.com
> 
> by
> 
> joe _AT_ broken _dot_ hill _dot_ com
> 
> for example
> 
> As you once remarked, i think, that will defeat 99% of
> the email harvesters, and will be much easier to implement

I wonder if even that level of disguise is needed.  Domain names
are not really sensitive in the great majority of cases, so
perhaps it will suffice to use
   joe _AT_ broken.hill.com
or more graphically
   joe(AT)broken.hill.com

Brendan.