Drupal allows you to override its default mail handling, by setting the 'smtp_library' variable to a file name, and including in that file a function called drupal_mail_wrapper()
that will send the mail. This function is called from drupal_mail_send()
in Drupal 6.x, and from drupal_mail()
in Drupal 5.x.
The function arguments changed in Drupal 6.x. In 5.x, the function arguments were the same as the arguments to drupal_mail()
(individual arguments for mail key, to, from, etc.). In 6.x, there is only one argument, a $message
array as in drupal_mail_send()
. See the respective calling functions for more information.