Hi, I suppose the endresult should be something like:
<p><a href="mailto:foo@bar.com">mail mr. foo !!</a></p>
you mention an email field. I dont know what this field looks like, but here's a simple way to get your data into html:
<xsl:template match="email">
<xsl:element name="a">
<xsl:attribute name="href">mailto:<xsl:value-of select="."/></xsl:attribute>
<xsl:value-of select="."/>
</xsl:element>
</xsl:template>
of course you can split up your email address by using some xslt string functions.