1. Install ssmtp rpm as,
#yum install ssmtp
2. Now edit ssmtp.conf file as,
#vim /etc/ssmtp/ssmtp.conf
root=XXX@gmail.com
mailhub=smtp.gmail.com:465
AuthUser=XXXX@gmail.com
AuthPass=<Password of gmail account>
FromLineOverride=YES
UseTLS=YES
TLS_CA_File=/etc/pki/tls/certs/ca-bundle.crt
3. After this, make ssmtp default mta as,
#alternatives --config mta
it will ask to choose mta, here select the ssmtp and enter.
4. Now send the mail as,
#mail -s "SUBJECT" xxxxx@abc.com
