Can't send anymore emails via smtp worked before fine, haven't touched anything...

Can't send anymore emails via smtp worked before fine, haven't touched anything...

Hi,
since some days suddenly I can't send out anymore emails. Before it worked fine! Haven't touched anything!

Now I deleted the account, created the pop account anew but no smtp connection....

pop.zoho.com
smtp.zoho.com via port 465 and ssl

Is there a problem between Apple and Zoho?? because I have suddenly problems on my Iphone as well.

Thanks for help
Katharina