I use SASHIMI to import this xml but AdvancedConfig should work for for this as well. Just choose import xml from the menu like you would for the settings backup.
Code:
<wap-provisioningdoc>
<characteristic type="EMAIL2">
<characteristic type="{ffffffff-8EE3-4881-8045-2AEE6F731B55}">
<parm name="SERVICENAME" value="Gmail"/>
<parm name="SERVICETYPE" value="IMAP4"/>
<parm name="INSERVER" value="imap.gmail.com"/>
<parm name="OUTSERVER" value="smtp.gmail.com"/>
<parm name="NAME" value="xxxYourNamexxx" />
<parm name="AUTHNAME" value="xxxYourEmailxxx@gmail.com"/>
<parm name="AUTHSECRET" value="xxxYourPasswordxxx"/>
<parm name="DOMAIN" value=""/>
<parm name="REPLYADDR" value="xxxYourEmailxxx@gmail.com"/>
<parm name="FORMAT" value="varFORMAT" />
<parm name="LINGER" value="240" />
<parm name="RETRIEVE" value="-1" />
<parm name="KEEPMAX" value="-1" />
<parm name="DWNDAY" value="3" />
<!-- "DWNDAY" value="3": retrieve messages only retrieved on inbox within last 3 days-->
<!-- "KEEPMAX" value="25": max of 25 email will be retieved -->
<!-- "RETRIEVE" value="2048": only 2k of each email will retrieved at the begin, aftherwards automatic download of the email
(it's also possibe to set retrieving to: header only) -->
<parm name="AUTHREQUIRED" value="1" />
<!-- Note the "AUTHREQUIRED" value="1": SMTH authentication is required by server, using the username and password from account for loging-->
<!-- Note the "AUTHREQUIRED" value="0": NO SMTH authentication is required by server -->
<!-- Note the "SMTPALTENABLED" value="1": SMTH authentication is required by server, using username and password from different account for logging
(parameter only nessecary in this case)-->
<parm name="SMTPALTENABLED" value="1"/>
<parm name="SMTPALTAUTHNAME" value="xxxYourEmailxxx@gmail.com"/>
<parm name="SMTPALTPASSWORD" value="xxxYourPasswordxxx"/>
</characteristic>
</characteristic>
</wap-provisioningdoc>
Here's the template xml for you too