Configure your local mail to be sent to your Gmail

Install exim4

sudo apt install exim4

sudo dpkg-reconfigure exim4-config

General type of mail configuration

 mail sent by smarthost; received via SMTP or fetchmail

System mail name

Leave default

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This is the name that will appear in the To: field of the email you receive. E.g. root@home-pc
IP-addresses to listen on for incoming SMTP connections

Leave default
```
 127.0.0.1 ; ::1
```
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Other destinations for which mail is accepted

Leave default (Same as “System mail name”)
```
 home-pc
```
Alt text
Machines to relay mail for

Leave empty.
IP address or host name of the outgoing smarthost
```
 smtp.gmail.com::587
```
Alt text
Hide local mail name in outgoing mail?

Leave default
```
 No
```
Keep number of DNS-queries minimal (Dial-on-Demand)?

Leave default
```
 No
```
Delivery method for local mail

Leave default
```
 mbox format in /var/mail/
```
Split configuration into small files?

Leave default
```
No
```
Root and postmaster mail recipient

Put your OS’ user here
```
your_user
```
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This will add the alias root: your_user to /etc/aliases

Note: this config only appears if you don’t yet have an alias for root in /etc/aliases.
If you set this config, it will not appear again when re-running sudo dpkg-reconfigure exim4-config

Enable 2-step verification to your Google account

https://myaccount.google.com/signinoptions/two-step-verification
Create an app password

https://myaccount.google.com/apppasswords

Configure exim4 to use your Google credentials

 sudo nano /etc/exim4/passwd.client

Add the following line

 smtp.gmail.com:{your_email_user}@gmail.com:{app_password}

sudo nano /etc/aliases

Add the following line

{your_os_user}: {your_email}

sudo systemctl restart exim4

echo "This is the body of the email" | mail -s "This is the subject line" root

tail -f /var/log/exim4/mainlog

Other related commands

sudo service exim4 restart
sudo update-exim4.conf
sudo exim4 -qff