no SMTP service and no reply to inquiries?

no SMTP service and no reply to inquiries?

We  are  trying  to  use  your  service  within  our registered domain
@expert.kiev.ua  however  your  mailing  system  still  proves to work
really  unsatisfactory;  for example none of our 23 users can send ANY
emails for so many hours - we get the error below:

>  31.10.2016, 17:13:52: SEND  - sending mail message(s) - 1 message(s) in queue
>  31.10.2016, 17:13:52: SEND  - Connecting to SMTP server smtp.zoho.com on port 465
> !31.10.2016, 17:14:13: SEND  - Could not connect to the server.

I'm afraid such unstable mailing system can't be used by any serious company where e-mail delivery is vital and not only income, but also image of company much depends on emails exchange.