Chrome extension allows you to record and send voice messages directly from your Gmail account.
How it works: SmallTalk adds a new extra button to the bottom right of any new email you compose and allows you to record a message in one clic. Once recorded, SmallTalk converts your recorded audio to a .MP3 file and attaches it to your outgoing email.
No need to register or login.
100% free.
My comment: Great utility makes sending voice messages via email a breeze. Truly free. Very useful. Recommended.
Try it out now: http://www.trysmalltalk.com/
Chrome extension: https://chrome.google.com/webstore/detail/smalltalk-record-audio-in/bcliigcohkmfgeimpibdmjbahbjhkbob