Is it possible to upload documents by sending an email to a specific email address & the documents are uploaded to a target Document Library?
I think this will answer your question:
In SharePoint Central Administration, go to the Operations tab and click on “Incoming Email Settings.” Enable sites to receive email, leave the setting for Automatic mode, leave the setting for SharePoint Directory Management Service to No, add the subdomain you have chosen to the field for E-mail server display address:, and choose whether you want to accept email from any host, or if you want to enter the FQDN or ip.addr of each of your hub transport servers.
This is a feature in Windows 2008. If you are not sure how to do this, see this article.
On your Exchange server, launch the EMC. Browse down to the Organization Configuration and click Hub Transport. Click the action item for “New Send Connector” to launch the wizard. Name the connector, in the Address Space enter the FQDN of your chosen SharePoint email subdomain (sp.retrohack.com in my example above.) On the Network Settings, choose to Route Mail Through the Following Smart Hosts, and enter the FQDN or the ip.addr of the SharePoint WFE on which you installed the SMTP service. Leave the authentication and Source Server settings to default.
In SharePoint, browse to the list or document library you want to receive email, click on Settings, Document Library Settings, and configure the settings the way the SharePoint admin wants.
also i had the IncomingEmail.aspx not found error which resolved by Correct AAM (source)