Incoming Email Sharepoint List workflow is not starting in the new item is created

1- First of all, we have check in SharePoint server setting if workflow trigger on email is enabled or not, and enable it.

Using STSADM 

Open the SharePoint 2010 Management Shell as administrator and run following command:

stsadm -o getproperty -pn declarativeworkflowautostartonemailenabled

Output should be:

PS 

If Value of property is “No” you have to enable it by typing following command:

stsadm -o setproperty -pn declarativeworkflowautostartonemailenabled -pv true.

Using PowerShell

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This property was somewhat easier to set using STSADM, however keep in mind that STSADM is being retired. PowerShell is the command line administration tool to use moving forward.

Open the SharePoint 2010 Management Shell as administrator and run the following to determine the value of the DeclarativeWorkflowAutoStartOnEmailEnabled property:

$spWebService = [Microsoft.SharePoint.Administration.SPWebService]::ContentService
$spWebService.DeclarativeWorkflowAutoStartOnEmailEnabled
If the Value of the property is "False" you have to enable it by typing the following commands:


Execute in the powershell script to set true in the DeclarativeWorkflowAutoStartOnEmailEnabled.
By default DeclarativeWorkflowAutoStartOnEmailEnabled property is false.


$spWebService = [Microsoft.SharePoint.Administration.SPWebService]::ContentService
$spWebService.DeclarativeWorkflowAutoStartOnEmailEnabled = $true
$spWebService.Update()