Install SMTP client on Ubuntu server

1. Install the light-weight SMTP client “ssmtp”
   sudo apt-get update && sudo apt-get install ssmtp
2. Configure ssmtp (sudo nano /etc/ssmtp/ssmtp.conf) [1] and set correct info for the following lines:
   1. root=
   2. mailhub=
   3. AuthUser=
   4. AuthPass=
   5. hostname=
   6. rewriteDomain=
3. Make aliases for the local user to correct email address [2]
sudo nano /etc/ssmtp/revaliases
4. ssmtp uses the local users Full name from the OS as the email sender, so make sure your name is correct. Change by using command
   sudo chfn -f "John Doe" yourUser

5. Verify ssmtp works by sending a test mail with command [3] ssmtp recipient@example.com

[1]: Example config

# Config file for sSMTP sendmail 
# 

# The person who gets all mail for userids < 1000 
# Make this empty to disable rewriting. 
root=kek@it-db.com 

# The place where the mail goes.
mailhub=smtp.it-db.com:587 
AuthUser=johndoe 
AuthPass=123456 
UseTLS=YES 
UseSTARTTLS=YES 

# Where will the mail seem to come from? 
#rewriteDomain= 

# The full hostname 
#hostname=MyMediaServer.home 
hostname=it-db.com 

# Are users allowed to set their own From: address? 
# YES - Allow the user to specify their own From: address 
# NO - Use the system generated From: address 
FromLineOverride=YES

[2]: Example aliases

# sSMTP aliases
#
# Format: local_account:outgoing_address:mailhub
#
# Example: root:your_login@your.domain:mailhub.your.domain[:port]
# where [:port] is an optional port number that defaults to 25.

kek:noreply@it-db.com

[3]: Example ssmtp test

ssmtp recipient@example.com
 Subject: Testing ssmtp
 enter your body text here
 via SMTP server.
 ^d