Yes, you can do an e-mail notification to multiple users. Kind of complicated if you haven't done before, but if you're already using it for others just right-click/copy a working user and then right-click paste (only e-mail attributes) to your new mbox.
To build the opt-out-for-vmail option:
In Voice Processor/Application Related/Audiotex Recordings, label the next 2 un-named recordings. We'll say it's recording 10 & 11, and name them "Queue 1" and Queue 2". Log into the vm admin mailbox, press secret 9 for admin options, follow directions to make a custom recording, and make those recordings...10 will say something like "All of our agents are busy" and 11 "Please continue to hold, or press 1 to leave a message and we'll call you back as soon as we can".
Change your mailbox greeting (2222?) to say simply "Please leave a message at the tone".
Now go into CRA 2710. Change digit time out to HANGUP (counter-intuitive, but trust me) and digit 1 to TRANSFER TO MAILBOX, destination 2222. Under DAY and NIGHT GREETINGS choose, in this order, 10, Q (bottom of pick list) and 11. If the order is wrong, drag-and-drop to fix. Dial 2710 to hear your finished product.
Last, go into the HG and change RECALL to NONE, ANNOUNCEMENT to 2710. Set TIMER for ANNOUNCEMENT to 45 seconds.
You're done! Call will ring HG. No answer in 45 sec, caller hears 2710. 1 goes to VM, no choice hangs up announcement while call continues to ring HG during and after announcement.
If you want to offer this option again occasionally, just put 2701 in the OVERFLOW field of HG and set OVERFLOW timer for how often you want to present.