Ability to enable or disable '[x] joined [site]...' emails

hmmm, yes this would be a relatively simple change. feel free to test and submit a patch.

I need to test this, still. Also, I'd suggest slightly different language for the settings form item. Something like:

  $form['og_mandatory_group_mail'] = array(
      '#title' => t('Email group managers'),
      '#type' => 'checkbox',
      '#default_value' => variable_get('og_mandatory_group_mail', 1),
     '#description' => t('Send email to a group's managers when a new user joins the site and joins their group or is assigned to it as a mandatory group.'),
  );

Hmmm, maybe it should be more like:

  $form['og_mandatory_group_mail'] = array(
      '#title' => t('Email mandatory group managers'),
      '#type' => 'checkbox',
      '#default_value' => variable_get('og_mandatory_group_mail', 1),
      '#description' => t("Should email be sent to the mandatory group's managers when a new user joins the site?"),
  );

Updated patch to Drupal-5.

Have patched the d6 module for this functionality the patch is attached.

please double-check your patch. Looks like you made whitespace changes (e.g. line endings ) that amek it difficicult to see where the actual changes occur.

I do not see any line endings in the patch, the reason for the changes is the if statement there that has moved everything on the patch.

Subscribing, very wanted feature.

We are running a site and encounter a strange side-effect related to this topic. We have Real Name installed, when these emails are generated from the site the username gets translated into random text, e.g. 'zcpECkyaNK' instead of the normal username.

Being able to modify the notification would be wonderful, or baring that, being able to disable these messages would be helpful too.

subscribing

This looks good to me. The whitespace changes are necessary to maintain proper indenting inside the new if block.