Ditto on what Danny said. The most logical way that a PPRuNee's email address could be obtained is via the 'show profile' option.
Somebody could indeed cut & paste the address from this screen into a list on another, or write / run a little program to sift out the single email address (this assumes that the address is visibile, i.e. that a contributor has allowed their email address to be seen by all and sundry) from the HTML source.
If you're not sure what I mean then, if you're using MS-Explorer, click on BEagle's profile at the top of this page and in the new page that then appears click on drop-down menu items View / Source (at the top of the window), and then search within the HTML code for the string 'Current Email:'.
All this aside, just think there's probably some poor bugger out there wildly pointing and clicking at PPRuNe profiles, hoping the email address is visible, so that thay can capture it into a list - it's really rather sad.
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CrashDive
Administrator to The Professional Pilots RUmour NEtwork
May you live in interesting times !