Remote Wave Free is an application that allows you to play audio attachments on email messages. This app supports various audio formats, such as ULaw(MULaw), GSM6.1, DSP TrueSpeech, and IMA/MS/Dialogic/OKI ADPCM. So, whether it's for music or voicemails, this app is a useful add-on to your email. 

Remote Wave Free supports different email platforms. It is also designed to be user-friendly and easy-to-use. When accessing an audio file attachment, you only need to open the attached file, click "Open with" and choose Remote Wave. Additionally, you can use the app as your default player. Just go to the app settings and select "Clear Default."