I dont know exaclty what youre doing, as you didnt provide any code.
But what about a "mailto:" link?
Opening the client is something that youd need to be doing on the client
side, so why not do something like:
<a id="openMail" href="mailto:
[email protected]"></a>
<script>
openMail.click()
</script>
I have tried it here, and it works fine. If you need it to open to a
specific address based on code, just do something like:
<a id="openMail" href="mailto:<%=TheMailAddress%>"></a>
<script>
openMail.click()
</script>
Of course, you can stick in all the other usual goodies on the link too,
like SUBJECT, CC, BCC, BODY or whate'r you may need.
Hope this helps.