We recently acquired multiple remote sites which will not be part of our domain. we have moved all the users to a hosted exchange service. We have had problems getting any of the canon IR MFP's to work with our hosted exchange SSMTP server. We have worked with both ends to resolve the issue but have had no success. This seems to be an issue specific to canon, our sharp copiers and virtual smtp server setup in IIS, connect and are able to send mail without issue. I would like to setup an SMTP server on our DMZ that we can point these canon copiers to allow for them to scan to email. I would need a public facing SMTP server to accept these emails and then relay them to our hosted exchange SSMTP server using something like the virtual smtp server we currently have setup in IIS. Security will also be a factor here as the content of the emails may contain confidential information. My assumption would be that simple SMTP using port 25 would not be the best method. I of course would like to avoid licensing for this server as it will more than likely be a temporary solution. Linux would seem like the obvious choice but i am not sure how to do this. Any suggestion for the simplest way to complete this would be appreciated.