Can I e-mail audio with audacity?If so how?Does the recipient of e-mail.also need to have audacity?

All Audacity does is export an audio file or save an Audacity project. How you get the audio file or the project to the user is up to you.

An audio file can be sent or uploaded to someone else, then the other user does not need Audacity. The audio file only needs to be compatible with that user’s operating system. You can attach a small, short lossy file like MP3 to e-mail in most cases, but you can never be sure what the size restrictions are on the e-mail service of the person you are sending to. It is better to upload files to a file storage service like dropbox.

You will rarely want to send the other user an Audacity project. Standard projects are perfect quality audio and very large. There is also a smaller “compressed copy of project” feature where the audio is a little lossy - this is more suitable for sending to others.

For more details, please see:
http://manual.audacityteam.org/o/man/audacity_projects.html .