Dear Manager,
This is Arshad, Senior Software Engineer in C#.Net with 5+ years of experience in designing Enterprise applications and it's supporting utilities.
Regarding your requirement, I have recently created one utility for my client for downloading e-mail attachment and put it on an FTP for further processing.
It supports search by folder, Subject, from email, unread only and by date. This is full proof tested and running in production.
Please let me know if you need it.