Email Basic Settings

The server has an SSL certificate and reverse DNS set so unless you have these set for your domain, it is better to use these for the best chance of successful mail delivery.

Incoming and Outgoing Server: ceres.uksrv.co.uk
(or your own domain if you have an SSL certificate configured)
Email Username : Your email address
Email Password : is set in your cPanel 

In your Email Client, ensure that you have the following settings…
Authentication:
 The Server Requires Authentication to Send.
 Use the same detail as Incoming (receiving).
Incoming Server Ports and Encryption (IMAP OR POP3):
 If using IMAP, Incoming Server IMAP port is 993.
 If using POP3, Incoming Server POP3 port is 995.
 Encryption is SSL.
Outgoing Server Port and Encryption (SMTP):
 Outgoing Server SMTP port is 465.
 Encryption is SSL.