There is no function like this, but just use Google translation from http://www.google.ca/language_tools?hl=en

<p>HI there</p><p> Can anyone help, please? </p><p>Looking to switch to Pegasus after a frustrating time with Mozilla Thunderbird. </p><p>I'm a member of a mailing list that includes Dutch and Belgian members where some e-mails are written in Dutch or French. Thunderbird has add-ons that enable automatic translation of the e-mail, typically by highlighting the relevant text and then clicking a menu to select translation.  </p><p> Is there anything similar in Pegasus?</p><p>Many thanks.</p><p> </p><p>Alan </p><p> </p>