Error after validation by email I have the following problem with drupal 6 and I am using the Login Tobogan module.  When an user creates a new account in Drupal, the user receives the respective email.  When the users click in the link for validate the account, the account is validated but appears the next error:

Unable to send e-mail. Please contact the site administrator if the problem persists.
You have successfully validated your e-mail address.


Thanks for your help.
I have disabled the Login Tobogan and I have enabled again the Login Tobogan again and the error was fixed.