I created a simple xpages application where you paste in your html(may i suggest something based on OneUI) into a field, preview it, and then send it to yourself as an html email( so you can then forward it to whoever), It took 30 minutes.
The Xpage source Code :
<?xml version="1.0" encoding="UTF-8"?><xp:view xmlns:xp="http://www.ibm.com/xsp/core" style="padding-left:20px;padding-right:20px;padding-top:10px">
<xp:this.data>
<xp:dominoDocument var="document1" formName="main"></xp:dominoDocument>
</xp:this.data>
<xp:table style="width:100.0%">
<xp:tr>
<xp:td>
<xp:button value="Close" id="button4"><xp:eventHandler event="onclick" submit="true" refreshMode="complete">
<xp:this.action>
<xp:openPage name="/view.xsp"></xp:openPage>
</xp:this.action></xp:eventHandler></xp:button>
<xp:button id="button2">
<xp:this.value><![CDATA[Save & Close]]></xp:this.value>
<xp:eventHandler event="onclick" submit="true" refreshMode="complete">
<xp:this.action>
<xp:actionGroup>
<xp:saveDocument></xp:saveDocument>
<xp:openPage name="/view.xsp"></xp:openPage>
</xp:actionGroup>
</xp:this.action></xp:eventHandler></xp:button>
<xp:button id="button3" value="Send"><xp:eventHandler event="onclick" submit="true" refreshMode="complete">
<xp:this.action>
<xp:executeScript>
<xp:this.script><![CDATA[#{javascript:
doc1 = database.createDocument()
doc1.appendItemValue("Form","Memo")
var3 = document1.getItemValueString('html')
body = doc1.createMIMEEntity()
subject = body.createHeader("Subject")
subject.setHeaderVal(document1.getItemValueString('subject'))
stream = session.createStream()
stream.writeText(var3)
body.setContentFromText(stream, "text/html; charset=iso-8859-1", 0)
doc1.appendItemValue("SendTo", document1.getItemValueString('creator'))
doc1.send()
}]]></xp:this.script>
</xp:executeScript>
</xp:this.action></xp:eventHandler></xp:button>
</xp:td>
</xp:tr>
</xp:table>
<xp:br></xp:br>
<xp:label value="Mail To:" id="label3" style="font-weight:bold"></xp:label>
<xp:br></xp:br>
<xp:inputText id="inputText1" value="#{document1.creator}" disabled="true"><xp:this.defaultValue><![CDATA[#{javascript:@Name('[CN]', session.getEffectiveUserName())}]]></xp:this.defaultValue></xp:inputText>
<xp:br></xp:br>
<xp:br></xp:br>
<xp:label value="Subject" id="label2" style="font-weight:bold"></xp:label>
<xp:br></xp:br>
<xp:inputText id="inputText2" style="width:400px" value="#{document1.subject}"></xp:inputText>
<xp:br></xp:br>
<xp:br></xp:br>
<xp:label value="Paste in HTML" id="label1" style="font-weight:bold"></xp:label>
<xp:br></xp:br>
<xp:inputTextarea id="inputTextarea1"
style="width:610.0px;height:326.0px" value="#{document1.html}">
</xp:inputTextarea>
<xp:br></xp:br>
<xp:br></xp:br>
<xp:button value="Refresh Preview" id="button1">
<xp:eventHandler event="onclick" submit="true"
refreshMode="complete">
</xp:eventHandler></xp:button>
<xp:br></xp:br>
<xp:br></xp:br>
<xp:label value="Preview" id="label4" style="font-weight:bold"></xp:label><xp:br></xp:br>__________________________________________________________________________________________________
<xp:br></xp:br>
<xp:br></xp:br>
<xp:text escape="false" id="computedField1"><xp:this.value><![CDATA[#{javascript:'<div id = "test me">' + document1.getItemValueString('html')+ '</div>'}]]></xp:this.value></xp:text></xp:view>