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$ sudo yum update -y
$ sudo yum install mailx -y
$ sudo mail -V
$ echo "This is test email" | mail -s "Test Email" root@localhost
$ tail -f /var/spool/mail/root

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$ mail -s "Hello World" username

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$ mail -s "Hello World" someone@example.com
$ mail -s "This is the subject" somebody@example.com <<< 'This is the message'
$ echo "This is the body" | mail -s "Subject" -aFrom:Harry\<harry@gmail.com\> someone@example.com

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$ mail -s "Hello World" user@yourmaildomain.com < /home/user/mailcontent.txt
$ echo "This is the message body" | mail -s "This is the subject" mail@example.com

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$ mail -s "Hello World" user1@example.com -c usertocc@example.com -b usertobcc@example.com

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$ mail -s "Hello World" user1@example.com,user2@example.com

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$ echo "This is the message body" | mail -s "This is the subject" mail@example.com -aFrom:sender@example.com
$ echo "This is the body" | mail -s "Subject" -aFrom:Harry\<harry@gmail.com\> someone@example.com