Someone, probably you, from IP address $1, has registered an account "$2" with this e-mail address on Planbook for Mac Documentation.
To confirm that this account really does belong to you and activate e-mail features on Planbook for Mac Documentation, open this link in your browser:
$3
If you did *not* register the account, follow this link to cancel the e-mail address confirmation:
$5
This confirmation code will expire at $4.