If you host with UK-Cheapest then already set up on your account for you is an SMTP Outgoing email server address of the following format,
mail.yourdomain.com
Replace yourdomain.com with your actual domain name.
However, some ISPs will not allow you to use your own SMTP server through their internet connection. In these cases they should allow you to therefore use their own smtp server which they provide to you.
If they will not allow this either, then you will need to contact them to remove the block they have placed on you using your own smtp server. See Which SMTP Server should I use?
Known companies that often block include BT and AOL, it appears that Nildram allow you to use your own server.
What is my SMTP outgoing email server? written by UKC average rating 3.7/5 - 3 user ratings