Kmail sound.

Sirs, Having used 'Outlook' in the past, I would like to know if it is possible to play a brief sound on the opening of an e-mail in Kmail, Mutt, or Mozilla. It takes a very small file, but differentiates from other e-mails. On the downside I believe this is only possible in 'html' mode. Thank you in advance for your interest. Malcolm Candlish.