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I *suspect* they mean that spamfilters and other mail management tools may block e-mails from being recieved, and thus newly created accounts aren't verified and activated.
I also *suspect* they mean that a simple check after x time and a resending of the activation mail is their solution.
I disagree. It's a possible solution, but one that could be misused and generate unneccesary traffic. What about adding a 'resend activation e-mail' function like the 'lost password' function? This means NO automatic resending, but only on request. Enter your e-mail address, check is made to see if it is in the inactive accounts list, if so, the activation mail is resent. That solution would have my personal preference...
Then again, I may have completely misunderstood...
Herko