Since switching to the latest VarAC, I've not been able to send VMAIL to a target station on a channel OTHER than the CF. If the target station does not respond to a QSY request, and the sender does not touch a key, there the sender is put back on the CF and nothing happens till a timeout occurs. Both stations are using the latest version.
If the sender requests a QSY, and the target does not reply, AND then the sender aborts, the VMAIL will be sent on the CF IF there is enough time remaining (less likely, with the time on the CF reduced to 4 minutes).
It USED to be that the sender could request a QSY, and the target station would QSY even when "AWAY', and the transfer could take place. This appears to no longer be the case.
If a "live" OP is required at both ends of the connection, for a VMAIL to be sent, then this (in my opinion) is a mistake, as it forces VMAIL back onto the CF.