.....unless you have et it to delete the messages once sent.....
Honestly, I forgot you could even do that with embedded voicemail on the 3300, I use it so rarely anymore... I had to go a system and look it up to be sure.
But back to @Saltrock23 question, it is (clearly?) stated in the Help that messages can and will get lost if they don't go through...
If "Delete After Forwarding" is enabled and this Email address is invalid, the voice message will be lost.Delivery to the Email address cannot be guaranteed. Enabling this option can result in message loss.My extrapolation from these two statements leads me to believe that (like the 5000 with similar options set), once a voicemail is received it is converted to an email and immediately deleted from the mailbox regardless of whether the message is sent or not, it then tries for a while to send and eventually gives up and just clears (deletes) that message as undeliverable, thus the message is permanently lost.