SME 6.5rc1 already has all required files you just need to issue
the following commands
config setprop smtp-auth-proxy status enabled
config setprop smtp-auth-proxy Userid yourlogin
config setprop smtp-auth-proxy Passwd yourpassword
config set SMTPSmartHost yourprovider-smtpserver
signal-event email-update
I have had no problems it has worked since the release of SME 6.5rc1