Setting up mailx to send mail from command line using external server

HOWTO_mailx.sh

# ref: https://coderwall.com/p/ez1x2w/send-mail-like-a-boss

# install mailx
yum -y install mailx

# create a directory with a certificate, to send mail using TLS
mkdir ~/.certs
certutil -N -d ~/.cert

# create a user ~/.mailrc, to use custom settings
cat <<EOT >> .mailrc
# external smtp server
set smtp-use-starttls
set ssl-verify=ignore
set nss-config-dir=/home/user/.certs
set smtp="smtp://mail.smtp.server:port"   # smtp://smtp.gmail.com:587, smtp://mail.company.net:25
set smtp-auth=login
set smtp-auth-user="[email protected]"
set smtp-auth-password="S3cr37"
set from="[email protected](My Name)"
EOT

# now send mail as you wish:
# NOTE: you may need to enclose mail addresses in <>, depending on server config.
#    - <[email protected]>

# simple message
echo "Your message" | mail -s "Message Subject" email@address

# with attachment
echo "Message" | mail -s "Subject" -a /loc/to/attachment.txt email@address

# A weekly report
git report | mailx -A gmail -s "Last Week Activity Report" [email protected]