Zoho Mail won't send via SMTP and won't receive from senders that are not from Zoho

Zoho Mail won't send via SMTP and won't receive from senders that are not from Zoho

We're facing problems with Zoho Mail where we won't receive e-mails from senders that are not zoho mails and we have an application that send mails using Zoho SMTP and this application logs as e-mail sent but no e-mail is being delivered at all. Is anyone else having this problems? Are there any Zoho services down at the moment?