Passing XML Serialized Object between domains

I am attempting to set up a "data sharing" scenario between my company and another company we work with. I want this data sharing to be automated with as little human interaction as possible. Both companies use .net programming platforms. I am trying to use XMLSerializer to convert the array of objects to xml form and I have this working. I am stumped by how to set up the actual exchange of the xml. I am currently writing the xml to a file and have verified the file contains the correct data.

Can someone help me with how best to go about sending the xml to our partner company in a way that allows them to load it into their system as easily and quickly as possible?

We are the recipient of data in a similar setup and our receiving code looks as follows:

List<TournyApprovedTeam> TournyTeams;
using (StringReader reader = new StringReader(HttpUtility.HtmlDecode Request.Form["XmlTeams"].ToString())))
{
                XmlSerializer serializer = new XmlSerializer(typeof(List<TournyApprovedTeam>), new XmlRootAttribute("TournyApprovedTeams"));
                TournyTeams = (List<TournyApprovedTeam>)serializer.Deserialize(reader);
 }

I need to know how this is being sent to us because I need to use the same type of code ...