this depends on a few factors.
where is the country id coming from?
Is is a select list that is showing the country name but has the country id for the value?
Does it need to pass the id for the value for other parts of the page to work?
If so, then you will need to create a lookup record set to filter the country id column on the value from the select list to return the country name, use the recordset value in the email.
If other parts of the page don't rely on the select list passing the country id, you can just set the select list to pass the country name instead.
I guess basically what I'm getting at is: if the only thing the page is doing is sending the email, the select list value doesn't need to be id, it can use the country name. If there is other processing, like storing in a database going on, you will need to evaluate whether the ID is needed or not. if it is needed, then you need to create a lookup recordset.