Blimey, what a palavah that was!

I've been using a module called Account Reminder to resend peoples registration details if they hadnt activated their account.

This is all fine and dandy, you can set it so it emails after a predefined period with custom email content etc. All good so far.

However, i set up a new site and the ip was in the Spamhaus PBL, long story short i had a bunch of users who wanted to play, but no emails as they had been bounced. I thought a quick drush.inc would do the job but it turns out there is actually an undocumented process (thanks to this roball on thread - http://drupal.org/node/400672)

If you have user who has never activated their account, and you would like to send them an email with login details - block them, and then unblock them!

simple.