Sending emails using Gmail and msmtp on Ubuntu / Debian

setup-msmtp-for-gmail.sh

#!/bin/sh
# Sending emails using Gmail and msmtp
# Author: [Josef Jezek](http://about.me/josefjezek)
# Donate: [Gittip](https://www.gittip.com/josefjezek)
# Link: [Gist](https://gist.github.com/6194563)
# Usage: setup-msmtp-for-gmail.sh

sudo apt-get update -q
sudo apt-get install msmtp-mta ca-certificates heirloom-mailx -yq

if command -v zenity >/dev/null; then
  GMAIL_USER=$(zenity --entry --title="Gmail username" --text="Enter your gmail username with domain (username@gmail.com):")
  GMAIL_PASS=$(zenity --entry --title="Gmail password" --text="Enter your gmail password:" --hide-text)
else
  read -p "Gmail username with domain (username@gmail.com): " GMAIL_USER
  read -p "Gmail password: " GMAIL_PASS
fi
 
echo # an empty line
 
if [ -z "$GMAIL_USER" ]; then echo "No gmail username given. Exiting."; exit -1; fi
if [ -z "$GMAIL_PASS" ]; then echo "No gmail password given. Exiting."; exit -1; fi

sudo tee /etc/msmtprc >/dev/null <<__EOF
# Accounts will inherit settings from this section
defaults
auth            on
tls             on
tls_certcheck   off
# tls_trust_file  /etc/ssl/certs/ca-certificates.crt
logfile /var/log/msmtp.log

# A first gmail address
account   gmail
host      smtp.gmail.com
port      587
from      $GMAIL_USER
user      $GMAIL_USER
password  $GMAIL_PASS

# A second gmail address
account   gmail2 : gmail
from      username@gmail.com
user      username@gmail.com
password  password

# A freemail service
account   freemail
host      smtp.freemail.example
from      joe_smith@freemail.example
user      joe.smith
password  secret

# A provider's service
account   provider
host      smtp.provider.example

# Set a default account
account default : gmail
__EOF

sudo chmod 600 /etc/msmtprc
sudo chown -R www-data:www-data /etc/msmtprc

HOST=$(hostname)

sudo mail -vs "Email relaying configured at ${HOST}" $GMAIL_USER <<__EOF
The postfix service has been configured at host '${HOST}'.
Thank you for using this postfix configuration script.
__EOF
 
echo "I have sent you a mail to $GMAIL_USER"
echo "This will confirm that the configuration is good."
echo "Please check your inbox at gmail."

Yeah

Thank you Sir, wonderful script.
As for the google security issue:

6. Enable "Less Secure Apps" In Gmail

By default, only the most secure sign-ins, such as logging in to Gmail on the web, are allowed for your Gmail account. To permit relay requests, log in to your Gmail account and turn on Allow less secure apps.
For more information, review the Google Support document "Allowing less secure apps to access your account."

source: Configure Postfix to use Gmail as a Mail Relay

tls_certcheck   off

why?

Regarding enabling less secure apps, it's better to enable 2-step verification and create a per-app password.

I am trying on Android to send mail... From PHP
I require to edit msmtp.cnf file for use mail() function I copied configuration code from your shell script. but not working .. for Android. If you know something can you provide info?? Please help sir

Hi, the scripts worked. Thank you for that, but the mail command still doesn't send mails..