We would get emails saying they did not receive an email with their tracking details. We would suggest for them to check their spam folder. A lot of times, it would be there.
I came up with two other ways to notify customers when their order ships. Twitter tweet and text message.
For example, the customer can check the "Text me when my order ships" and provide their cell phone number. Once we ship out their package, our shipping application will text them.
Does anyone else have this issue about not receiving emails?