3G iphone + one2free + netvigator

just finished setting up using new phone to access netvigator email account.

incoming : pop.netvigator.com
smtp : mail.one2free.com

i could retrieve emails successfully but couldn't send out email.

screen shows "Cannot Send Mail The connection to the outgoing server "mail.one2free.com" failed.

can anyone help ??? i had no problem accessing websites or using beejive (msn) using wifi or 3.5G