Here are my settings from one of my provxml files I use that sets up one of my gmail accounts....You need to change the SMTP outgoing mailserver information highlighted in the darker blue. Sprints tech support can walk you through it.
Code:
<characteristic type="EMAIL2">
<characteristic type="{86bcb241-aec1-4800-bd9c-2d5e7ee00005}">
<parm name="SERVICENAME" value="Gmail - rstoyguy" />
<parm name="SERVICETYPE" value="IMAP4" />
<parm name="INSERVER" value="imap.gmail.com" />
<parm name="OUTSERVER" value="smtp.gmail.com" />
<parm name="NAME" value="rstoyguy" />
<parm name="AUTHNAME" value="rstoyguy@gmail.com" />
<parm name="AUTHSECRET" value="deleted" />
<parm name="DOMAIN" value="" />
<parm name="REPLYADDR" value="rstoyguy@gmail.com" />
<parm name="LINGER" value="120" />
<parm name="RETRIEVE" value="-1" />
<parm name="KEEPMAX" value="-1" />
<parm name="DWNDAY" value="-1" />
<parm name="FORMAT" value="2" />
<parm name="AUTHREQUIRED" value="1" />
<parm name="SMTPALTENABLED" value="1" />
<parm name="SMTPALTAUTHNAME" value="dmcniel08" />
<parm name="SMTPALTPASSWORD" value="deleted" />
<parm name="SMTPALTDOMAIN" value="smtp.sprintpcs.com" />
</characteristic>
</characteristic>