I think an adequate explanation for the URL-fetch
mystery is that some
people
run a virus scanner or have their e-mail delivered to a mailservice
that does
scanning, and this scanner fetches all URLs in the message to check if
they
point to malware...
No amount of validation of the subscribers will solve that problem.
The only thing you can do is obfuscate the links, but that is
incovenient for
the reader.
Similar problem: whenever you download a program, a second fetch is
done by
Microsoft/Google/Apple/whatever your favorite vendor to check what it is.
I have seen this several times on a download server we run at work.
Rob
Summarizing the problem, as per my understanding, since
it's almost unavoidable that intruders hit and spy our systems
any action taken will be, with good approximation, destined
to fail; the way, if exists, is to find a ham solution...
--
73 and ciao, gus i0ojj
A proud member of linux team
Non multa, sed multum