There are two monitored hosts now. They both have some services monitored and linked to the same template. Suddenly, the situation changes: one of the hosts gets a new function and the email server is removed. Our options from the Zabbix viewpoint include simply disabling email-related items for that host, or creating a separate template for it and removing email-server-related entities from the main template, instead leaving them on the other server. There's a better approach, though: splitting email-server-related entities into a separate template.
Navigate to Configuration | Templates, then click on the Create template button. Enter C_Template_Email in the Template name field, select Custom templates in the Groups ...