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I have learnt to read mails in /var/spool/mail/root. But I know nothing about these mails, I mean who sends these mails, what information they deliver and what do we need about these mails...blah blah blah..
Would anyone be kind enough to make me understand this?
/var/spool/mail/ is a common location to tore internal mails for all UNIX accounts, not only for root. You should not confuse this with e-mails sent via POP3 accounts. It is quite possible to have e-mails stored in a completely different location (usually your home directory, for example when using thunderbird as the mail client) then the system mails.
The /var location is the default location for interim files generated by the system. Besides system mails it also contains log file and other stuff.