Specifies which files the task should include as attachments in the outgoing message.
Attachments may be used when sending an email to specify which files will be included as attachments to the outgoing message.
The value should be a pipe ("|") -delimited sequence of one or more filenames. The filenames should be specified with paths if necessary, so that the files may be found on the local file system.
If this property is set to an empty string, no attachments will be included in the outgoing message.
This property is not available in the Receiver.