External @zoho.com mail stopped working today, yesterday no issues

External @zoho.com mail stopped working today, yesterday no issues

Hello,

Over a sudden mail stopped being delivered to inbox. 
Domain is standard zoho.com worked no problem yesterday, today nothing in inbox.
Sent several test emails from corporate account & from gmail.com, logs show acceptance by zoho mail server, but nothing delivered to inbox. Checked spam, "all mail", etc. storage is below 50%. Nothing recent shows using mobile access via exchange interface or via web i.e. mail.zoho.com, last email is from yesterday.
Sending mail to myself from zoho account works, but nothing from outside reaches inbox.

This is primary email, already contacted support, no response yet...

What to check? Any assistance is greatly appreciated.

Thanks!

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