When attempting to upload files to file storage, the process does not complete. On mail servers with this problem, SmarterMail is using a public IP for the communication between the Web interface and the SmarterMail service when doing a file upload to file storage. SmarterMail uses ports 17001 and 17002 for this type of communication and these ports generally are not open in a firewall.
This issue may present with the following error: "Error uploading one or more files. Please verify that the file does not exist and is not of a restricted type." NOTE: If using IIS 7.0, ensure that the application pool utilized by SmarterMail is set to integrated mode.
Change the remote service to use IPC instead of TCP for it's communication protocol.
<add key="MailServiceAddress" value="127.0.0.1" />
Open ports 17001 and 17002 in your firewall. You probably won't need to open these ports for all IP addresses, just those IP addresses used by the SmarterMail server.
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For faster and more reliable delivery, add firstname.lastname@example.org to your trusted senders list in your email software.