Not sure if this is helpful at all, or if someone else has already found another way, but I've managed to get vm to email working from an embedded system using a Gmail account.
All that was required was a bit of software called Stunnel and a few extra minutes to configure. The software basically accepts an email from the IP Office and adds SSL to it before allowing the connection to the Gmail server. The software is freely available from: http://www.stunnel.org/
In the IP Office, set the SMTP server to be the IP address of the PC running Stunnel, and set the port to something free. (I used 8111) Set the send from address as the gmail account you wish to send from. Tick Server Req's Auth and enter the Gmail account login and password.
Configure your user email settings as required and install Stunnel on the PC with the IP address as defined earlier.
When installing the software, a command prompt will ask for some location details - I just entered localhost for the server name and junk data for location information.
Once its installed, you will need to run it and right click its icon in the system tray. Then click on edit stunnel.conf.
Find the section titled [gmail-smtp] and delete the semicolons (;) from the start of each line. Then change the port number at the end of the loopback address to whatever you set as the smtp port in the IP Office.