All e-mail ZOHO addresses are unavailable

All e-mail ZOHO addresses are unavailable

Hi,


from today morning (before 6 hours) we cannot get any e-mail to ZOHO hosted mail boxes with that detail:

5.0.0 smtp; 550 5.1.1 < bezdek@b-techs.cz >: Recipient address rejected: User unknown in relay recipient table

Permanent Failure - Other or Undefined Status

The same for obchod@b-techs.cz mailbox.

Why?