Was sending and receiving email, but now is no longer receiving. PLS HELP!

Was sending and receiving email, but now is no longer receiving. PLS HELP!

Hello, until this morning my Zoho mail was sending and receiving e-mail normally, but now the evening is just sending and receiving is not. I have not changed any settings. http://mxtoolbox.com/ is pointing to mx.zohomail.com and mx2.zohomail.com. How can I solve this?