We have SharePoint 2013 Foundation running on an IIS 8 VM. The server is Windows Server 2012 Data Center. My company uses a hosted Exchange service (Exchange 2010). I have the SMTP FQDN and TCP port used for relay that the Exchange hosting company gave me.
Essentially the hosting company requires relay.hostingco.com (this is made up of course) on TCP port 2525 and no authentication. I have this set up in IIS in the SMTP properties for the SharePoint - 80 site.
I then have SharePoint set up to send email to my IIS host (call it intranet.mycompany.com). It's set this way because SharePoint can't be configured to use unique TCP ports or authentication as you know.
None of this works. I've called the hosting company and they say I have everything right although I don't think they're SharePoint experts.
Can anyone think of something I missing?
Much thanks in advance.