Not Recieving email from at least 1 specific email address

Hi, I've learned that my email isn't receiving email from people. Especially one specific email.

I've checked my junk it's not there. They also keep getting a bounce back on my email too.

With that being said, they have responded to emails. I've sent them (with attachments) it's only when they send me a email directly unprompted by me.

Amanda