Sharepoint - SharePoint 2013 email templates
As a developer you have several ways to customize the alerts.
In order to insert your company's logo, you will have to implement your own iAlertNotifyHandler.
You can get an overview about your possibilities here: "msdn Library > Alerts in SharePoint Foundation"
The article says nothing about SharePoint 2013, but when you look in the documentation for "msdn Library > SharePoint schemas > AlertTemplates schema", you'll find that it still works with SharePoint 2013.
Here are two tutorials that should help you:
- How to: How To: Customizing alert emails using IAlertNotifyHandler
- SharePoint 2010 custom alert template
There is few change in the C# code used for SharePoint 2013. Here is step by step guide for implementing it in SharePoint 2013.