I Am Having Problems Sending Emails. I've Check The Address, Til Having Problems

I hope you can help me sooner than the 10 minutes the website asked me to wait. A certain email isn't working. I've check the email address and it correctly written, and double checked with the company.

What must I do?

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Someone sent me a message and I haven't received it. What happened? | Yahoo! Mail Classic Help
... not addressed properly. The sender might not have your correct email address. Or, sometimes people make typos in email... incorrect address just turns out to be someone else's correct email address. If this happened, the message intended for you could have been received by .... Are you a Mail Plus user? Good choice! Check to see if you set your mail to be forwarded to another email address. Click "...
Someone sent me an email and I haven't received it. What happened? | Yahoo! Mail Help
...sure that they actually sent the email and aren't having problems with their mail server..... The sender might not have your correct email address. Or, sometimes people make ...else's correct email address. If this happened, the email intended for you could have been ...! Check to see if you set your mail to be forwarded to another email address....-send the email. Also, check your mail again to see if you've...
Why was my email neither received nor bounced? | Yahoo! Mail Help
...a draft, click on your Draft folder. The email was not addressed properly. You might have accidentally entered a different email address than the one you intended, or entered a typo that actually turns out to be a real email address. Check to see if this happened by looking in your Sent folder. Take a close look at the address ...