I first sent a test message to confirm it was delivered successfully. So, this issue is likely related to your email client setup.
Since I am not sure what you are using to check your email, here is a link to our Getting Started guide
, which has links to guides on the major email clients (Outlook, Thunderbird, Mac mail, etc.).
I recommend following the guide for your specific email program, and confirming the settings were entered successfully.
If you have any further questions, feel free to post them below.