~]$ certutil -L -d certs

Certificate Nickname                                         Trust Attributes
                                                             SSL,S/MIME,JAR/XPI

GeoTrust SSL CA                                              ,,
VeriSign Class 3 Secure Server CA - G3                       ,,
Microsoft Internet Authority                                 ,,
VeriSign Class 3 Extended Validation SSL CA                  ,,
Akamai Subordinate CA 3                                      ,,
MSIT Machine Auth CA 2                                       ,,
Google Internet Authority                                    ,,

~]$ certutil -L -n 'Google Internet Authority'  -d certs -a > google.cert.asc

~]$ certutil -A -t "C,," -n 'Google Internet Authority'  -d certs -i google.cert.asc

~]$ certutil -L -d certs

Certificate Nickname                                         Trust Attributes
                                                             SSL,S/MIME,JAR/XPI
...
Google Internet Authority                                    C,,

~]$ /bin/mailx -A gmail -s "Whadda ya no" somebody@acompany.com
ho ho ho
EOT
~]$

~]$ certutil -A -t "C,,"
                 -n 'gmail.com'
                 -d certs
                 -i 'http://google.com/cert/this...'

# Create a certificate directory
~]$ mkdir certs

# Create a new database in the certs dir
~]$ certutil -N -d certs

# Need now a chain certificate - May 18, 2015
~]$ wget https://www.geotrust.com/resources/root_certificates/certificates/GeoTrust_Global_CA.cer

# Need now a chain certificate part 2 - May 18, 2015
~]$ mv GeoTrust_Global_CA.cer certs/

# Fetch the certificate from Gmail, saving in the text file GMAILCERT
# Added the CA opion - May 18, 2015
~]$ echo -n | openssl s_client -connect smtp.gmail.com:465 -CAfile certs/GeoTrust_Global_CA.cer | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > GMAILCERT

# Import the new cert file into the new database in the new dir
~]$ certutil -A -n "Google Internet Authority" -t "C,," -d certs -i GMAILCERT

# Double Check
~]$ certutil -L -d certs

Certificate Nickname                                         Trust Attributes
                                                             SSL,S/MIME,JAR/XPI

Google Internet Authority                                    C,,

# Create a certificate directory
mkdir ~/.certs

# Create a new database in the certs dir (dont forget to enter your pass phrase!)
certutil -N -d ~/.certs

# Create three files for the cert chain
touch ~/.certs/google ~/.certs/geotrust ~/.certs/equifax

# Copy the cert chain for smtp.google.com:465 over to my_certs file (don't forget the -showcerts option, CTRL + C to end this command)
openssl s_client -showcerts -connect smtp.gmail.com:465 > ~/.certs/my_certs

# Open your my_certs file you made earlier and copy the google cert (usually the first one)
nano ~/.certs/my_certs

# Open your google file, paste the google cert that you just copied, and save and close
nano ~/.certs/google

# Open your my_certs file you made earlier and copy the geotrust cert (usually the second one)
nano ~/.certs/my_certs

# Open your geotrust file, paste the geotrust cert that you just copied, and save and close
nano ~/.certs/geotrust

# Open your my_certs file you made earlier and copy the equifax cert (usually the third one)
nano ~/.certs/my_certs

# Open your equifax file, paste the equifax cert that you just copied, and save and close
nano ~/.certs/equifax

# Import the google cert into the db
certutil -A -n "Google Internet Authority" -t "TC,," -d ~/.certs -i ~/.certs/google

# Import the geotrust cert into the db
certutil -A -n "GeoTrust Global CA" -t "TC,," -d ~/.certs -i ~/.certs/geotrust

# Import the equifax cert into the db
certutil -A -n "Equifax Secure Certificate Authority" -t "TCP,," -d ~/.certs -i ~/.certs/equifax

# Double check to make sure everything imported correctly into the db
certutil -L -d ~/.certs

Certificate Nickname                                         Trust Attributes
                                                             SSL,S/MIME,JAR/XPI

Google Internet Authority                                    CT,,
GeoTrust Global CA                                           CT,,
Equifax Secure Certificate Authority                         CT,,

# Remove all unnecessary files since the db has the certs :)
rm -rf ~/.certs/google ~/.certs/geotrust ~/.certs/equifax ~/.certs/my_certs

# Now run a test to make sure mailx is sending correctly now (don't forget to change yourname@example.com to the email address you'd like to send to)
echo "Your message" | mail -s "Message Subject" yourname@example.com

# /etc/mail.rc options added to the bottom
set smtp-use-starttls
set smtp-auth=login
set smtp=smtp://smtp.gmail.com:587
set from="your.from.user@gmail.com(Web01 Server)"
set smtp-auth-user=your.smtp.user@gmail.com
set smtp-auth-password=your.pass
set ssl-verify=ignore
set nss-config-dir=/root/.certs