> The preceding @ ensures that the match is an email with the example
> domain. The preceding . ensures that the match is the domain used in a
> host link like www.example.com and so forth. Without these preceding
> characters the following might also match incorrectly...
> 
> legitimatexample.com
> 
> Using the preceding characters prevents this.

I would add that if the address is long enough you may 
be able to get away with it.  That is, you don't need
the preceding characters if the domain name is long
enough.  There is, however, a chance the name could
catch another domain ending with the same text, so
it would be best practice to use the preceding
characters and sometimes adding the following will
help catch more:

@same_name.com          "same domain name different character"
.same_name.com          "same domain name different character"

PS:     Don't forget, the daily updates can be downloaded from the 
        following url: www.imagefxonline.net/apps/delog/daily.txt


Regards,
Tom
Image`fx
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