can we configure postfix in our laptop running linux?
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Yes, you can set up Postfix on your laptop to try it out with a configuration for a local domain. The only basic thing a domain does is point to an IP, so you can configure 'whatever' you want on your computer, for example mypostfix.local. Have a look at the Postfix Standard Configuration Examples.
sarah.in or sarah.local for example are also valid hostnames. Just make sure that you put them in your /etc/hosts file pointing to the correct IP (127.0.0.1 if on the localhost) and make sure that in the /etc/nsswictch.conf file the hosts order lists files first so that your DNS doesn't try to resolve the domain name.