Setup Postfix & Sendmail

1. setup mailx

Create file .mailrc in the user home directory as below

vi ~/.mailrc as below
#set smtp-use-starttls
#set nss-config-dir=~/.mozilla/firefox/xxxxxxxx.default/
#set ssl-verify=ignore
set smtp=smtp://smtp.gmail.com:465
#set smtp-auth=login
#set smtp-auth-user=$FROM_EMAIL_ADDRESS
#set smtp-auth-password=$EMAIL_ACCOUNT_PASSWORD
set from="gmailaccount@gmail.com"

2. Test send email
echo "Test Mail - `date`" | mailx -s "Database Alerts" gmailacc@gmail.com

3. Create SMTP Server Relay using postfix
Edit file /etc/postfix/main.cf as below


# readme_directory: The location of the Postfix README files.
#
readme_directory = /usr/share/doc/packages/postfix/README_FILES
inet_protocols = all
biff = no
mail_spool_directory = /var/mail
canonical_maps = hash:/etc/postfix/canonical
virtual_alias_maps = hash:/etc/postfix/virtual
virtual_alias_domains = hash:/etc/postfix/virtual
relocated_maps = hash:/etc/postfix/relocated
transport_maps = hash:/etc/postfix/transport
sender_canonical_maps = hash:/etc/postfix/sender_canonical
masquerade_exceptions = root
masquerade_classes = envelope_sender, header_sender, header_recipient
myhostname = localhost
program_directory = /usr/lib/postfix
inet_interfaces = all
masquerade_domains =
mydestination = $myhostname, localhost.$mydomain
defer_transports =
mynetworks_style = subnet
mynetworks = 192.168.0
disable_dns_lookups = no
relayhost = smtp.gmail.com
mailbox_command =
mailbox_transport =
strict_8bitmime = no
disable_mime_output_conversion = no
smtpd_sender_restrictions = hash:/etc/postfix/access
smtpd_client_restrictions =
smtpd_helo_required = no
smtpd_helo_restrictions =
strict_rfc821_envelopes = no
smtpd_recipient_restrictions = permit_mynetworks,reject_unauth_destination
smtp_sasl_auth_enable = no
smtpd_sasl_auth_enable = no
smtpd_use_tls = no
smtp_use_tls = no
alias_maps = hash:/etc/aliases
mailbox_size_limit = 0
message_size_limit = 10240000
myorigin = gmail.com