David,
Looking through the mod files again I realized I hadn't added this to the installation directions:
In order for users to be able to turn off the automatic emails, you must create a custom profile field to store this data. In the Admin section, choose "Custom Profiles" from the menu. The new field name is "phorum_mod_group_autoemail_user_unsubscribe_setting" and it should have a field length of 3. You can leave "Disable HTML" checked. Click on "Add" and the field should show up in the list of custom profile fields.
Try that to see if it helps. I will look into the possiblity of the option to only receive new topics. I may also bring attachment sending to this version of the mod also.
Looking through the mod files again I realized I hadn't added this to the installation directions:
In order for users to be able to turn off the automatic emails, you must create a custom profile field to store this data. In the Admin section, choose "Custom Profiles" from the menu. The new field name is "phorum_mod_group_autoemail_user_unsubscribe_setting" and it should have a field length of 3. You can leave "Disable HTML" checked. Click on "Add" and the field should show up in the list of custom profile fields.
Try that to see if it helps. I will look into the possiblity of the option to only receive new topics. I may also bring attachment sending to this version of the mod also.