[LINK] Putting "no spam" warnings on websites
glen.turner at aarnet.edu.au
Wed Apr 21 15:39:23 EST 2004
Ash Nallawalla wrote:
> If you are forced to display an email address that is used only for initial
> contact, use aliases and keep changing them as often as is practicable.
You can pretty easily generate a new e-mail address for
each web-page view.
jfhhgjhfdg at webmaster.example.edu.au
where jfhhgjhfdg changes with each page view (so the
'contacts' page should be marked non-cachable).
Get your e-mail delivery agent (sendmail, etc) to re-write
webmaster+jfhhgjhfdg at example.edu.au
This will drop the message into the "webmaster"
Use procmail to track the uniqueness of the "+jfhhgjhfdg"
part of the name (it's in $1, you can see how to handle
uniqueness in procmail's vacation examples). Deliver
unique strings, silently drop the string if seen
Of course in the long run spammers could spam you
simply by dreaming up their own unique addresses.
If that worries you, append a checksum of the
random string and some secret text to the random string.
Check the checksum in procmail too.
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