AOL and Yahoo do not allow third parties like ASEBA to send e-mail using their domain names. If your account e-mail address is email@example.com or firstname.lastname@example.org, your messages won't go out to informants.
The solution is to use a different address for your account. To change your address:
1. Log into ASEBA-Web
2. Select My Account Tab, then Users Management
3. Select the user whose email address you wish to change on the left
4. Click the "Edit" button on the right
5. Change the address in the "Email" field
6. Click "Save"
This does not affect what addresses you can send e-mails to, only what addresses you can use to send e-mails from.