Help Mail configuration

[pingme@g1]

I am trying to setup an email account to check my office mail and the incoming connection settings were fine, but the outgoing (SMTP) connection is not going through since my office mail does not support smtp from external network. So Planning to skip the outgoing settings, but there are no options to skip this. Anyone aware of it ? Also there was a button "Manual Setup", but it has no action. It was dehighligted, any other setting necessary for this ? Your help is appriciated.