Email not being delivered

I have an issue that just started about 2 weeks ago. I have been getting emails from a company (6 of them), and then on August 22, 2015 they stopped. They aren't in my junk mail, and they aren't coming. He forwarded the same email to my husband who forwarded it to me with no problem. I just want to know what happened! Is there a way to block a sender by accident?

Please help me!