Not receiving notification of new followers

I have noticed that I am not receiving email notification when new followers begin following me. I do have that option enabled in my Twitter settings. This has been happening for about 2 weeks or so. At first I thought it was something with my email client but it is not. The email notifications are not going to my junk or deleted folders.

If anyone could please help in resolving this issue, it would greatly be appreciated.

Thank you in advance,

Erick B