Today I will talk about a bug in the tasks lists of in SharePoint 2013.
Indeed, in previous versions of SharePoint, when a task was assigned to a user, we can specify via the SharePoint interface that a mail was sent to the person.
Unfortunately, this option does not appear on “tasks” list (but is still present on the lists of type “Issue”).
If you need this option on lists, know that you can enable this feature through the following PowerShell script:
$web = Get-SPWeb “your_site_url“
$list = $web.Lists.TryGetList(“your_tasklist_name“)
$list.EnableAssignToEmail = $true
Once this script is run, you can save the list as a template so you can reuse your list with mail sending.
Attention, the script active functionality, it does not display the option in the settings!
According to this post (http://social.technet.microsoft.com/Forums/sharepoint/en-US/8ee6bd15-6aae-43c1-a853-66ae6523adbc/assigned-to-email-alert-issue?forum=sharepointgeneral) the cumulative update of April 2013 fixes the bug.
I can’t say that CU fixes the bug, but I can say that on an updated version of SharePoint 2013, the option is back!
Hope this helps.