All attachments being renamed to "Part 1.2"

[ks]

I recently setup a Scalix server using Mailwasher for spam checking and ClamAV for virus protection. Sending email attachments from the web client or Thunderbird seems to work fine. But we have a .NET program that emails reports as attachments, and the attachments are being renamed to, "Part 1.2". We are coming from an Exchange server, and this didn't happen before. The only part of the code that I changed was the server IP address.

Does anyone know what might be causing this?

[ks]

Solution:

In my code I was not specifying the content type (such as text/plain, application/pdf). This worked fine with Exchange, but caused the attachment to be unnamed with Scalix. The Part 1.2 came from Thunderbird, different email clients may call it something else when there is no name.