It's also been happening to me for a week or so too. Has this been resolved?
You may want to try creating a filter using your email service that always allows messages from @niketalk.com.
Here's how to do that in GMail:
1. Click the settings gear:
2. Click "see all settings":
3. Choose
Filters and Blocked Addresses.
4. Select "Create a new filter."
5. Enter @niketalk.com in the box labeled "From:"
6. Click the "create filter" button.
7. Check the box next to "Never send it to Spam."
You can also choose a category or label for these messages if you don't want to look for them in the default "categories" labels like "social," "forums," "updates," or "promotions."
Give that a try and then see if new messages start to flow in properly. Note that this action will not retroactively affect previously received messages. You may still be able to find these by searching your inbox, if they haven't been deleted.