Outlook not recognising Zoho Inbound server

Outlook not recognising Zoho Inbound server

I have been receiving my ZOHO emails using MS Outllok on my iPhone and PC, but since Friday 2nd May, incoming emails are not arriving via Outlook and I get the error message saying the server is 'not responding'.  Have ZOHO changed the settings for the Incoming server ..? Please someone confirm the settings ...? Thanks ... Bill