I have the code that send email via internet, but I don't know how to sent email via local intranet. For example, staff send email to manager for approving something, than manager will send back the message to staff whether approve or reject the request. This process is happen in the same building via local intranet.
Thank you for your help.

If the internal email is handled by a special smtp server, it's possible to send email to it specifically, by opening a socket to it, and feeding it the right stuff.

Here is the function you'd need, in this forums.devshed.com.

Otherwise you'll have to give us some more info on how the intranet server email works - is it using Microsoft Exchange server or what, and how does your email client work with it?

GF