zoho email can receive emails from gmail, but not from yahoo?

zoho email can receive emails from gmail, but not from yahoo?

      Hi, I've recently set up a number of email accounts, MX records are all up to date. emails can be sent out just fine, but when I test to receive emails, they are received fine from gmail, but when I send from yahoo I get the following message; Sorry, we were unable to deliver your message to the following address.

 

<info@icf-ltd.co.uk>:

Remote host said:

550 <info@icf-ltd.co.uk>: Recipient address rejected: User unknown in virtual mailbox table  [RCPT_TO]

 Any idea what to do about this?