I'd like to second this request from earlier:
My host has now blocked outgoing e-mail, and I've had to deactivate your plugin because of the format of the message.
please click on the following link: http://DOMAIN.com/?wp-subscription-manager=1&verify=0cd32a50a271b98 to confirm your subscription.
I generally don't make changes to plugin code because they'll be overwritten during the next upgrade.
Do you have any estimates for when the ability to format the outgoing message might be available?