Read zoho from Outlook.com ¡problem with a lot of domains!

Read zoho from Outlook.com ¡problem with a lot of domains!

Hi.

I read/send my zoho account (custom domain) with Outlook.com. Today i start to get error in Outlook.com (can't connect to pop.zoho.com). I have this problem in a lot of customers accounts.

Where is the problema? Outlook?, Zoho?

@espectaculosruiz.com