SharePoint (MOSS 2007) Incoming Email is not working. EMAIL is not picked up from the DROP (C:\inetpub\mailroot\Drop) folder

EMAIL is not picked up from the DROP (C:\inetpub\mailroot\Drop) folder and got the error(exception) in Event viewer
A critical error occurred while processing the incoming e-mail drop folder . The error was: Value cannot be null.
Parameter name: path.
The Execute method of job definition Microsoft.SharePoint.Administration.SPIncomingEmailJobDefinition (ID df74919a-8a3d-4019-869c-fc5599909785) threw an exception. More information is included below.
Value cannot be null.
Parameter name: path



Solution

1. Check whether SMTP service and SharePoint Timer service is running on the SharePoint server
2. Give access to WSS_ADMIN_WPG (Full control) and WSS_WPG (Read/Write) to the DROP (C:\inetpub\mailroot\Drop ) folder
3. Check access for the SharePoint site (apps.ul.com) also for timer account to update the email into the document library which is configured.
4. Change the incoming drop folder settings on the Sharepoint Central administration site

Central administration -> Operations -> Incoming email settings. Change the email drop folder to (C:\inetpub\mailroot\Drop) folder