= Sending Email =

The 825gen2 can send emails.

The sendmail and msmtp commands are included in our Yocto Linux build.

{{{
cd /home/root


Create the msmtp config file

nano ~/.msmtprc

defaults
tls on

account gmail
auth on
host smtp.gmail.com
port 587
user wilsonwareapps@gmail.com
from wilsonwareapps@gmail.com

account default : gmail
}}}

Google no longer allows applications to use regular Google login password. 
Create an app specific password in google web portal

[[Image(google_app_password.png)]]

Keep a record the generated password
{{{
ueut eapo jrqv eaid
}}}

Create an email

{{{
nano message.txt

From: wilsonwareapps@gmail.com
To: don@wilsonware.com
Subject: Test email from 825

Test 825ARM Variscite

123456
abc
}}}

Send the email

{{{
msmtp -t < message.txt
password for wilsonwareapps@gmail.com at smtp.gmail.com: 
}}}

Enter the app password. Email was sent successfully.

How to store password to not require password entry every time email is sent?

Password can be added to config file such as:

{{{
nano ~/.msmtprc

defaults
tls on

account gmail
auth on
host smtp.gmail.com
port 587
user wilsonwareapps@gmail.com
from wilsonwareapps@gmail.com
password ueut eapo jrqv eaid

account default : gmail



root@imx8mq-var-dart:~# msmtp -t < message.txt
}}}

E-mail sent successfully with no prompt for password

This could be done from app code using a system call.


How to send file attachments?

msmtp does not have support for file attachments directly. The message must be encoded in mime format.

Update message.txt to add MIME encoding

{{{
nano message.txt

From: wilsonwareapps@gmail.com
To: dwilson@cardet.com
Subject: Test email from 825
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="MyBoundaryString"


--MyBoundaryString
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

This is a message.

--MyBoundaryString
Content-Type: text/plain; file="file123.txt"
Content-Disposition: attachment; filename="file123.txt"
Content-Transfer-Encoding: base64

}}}


Create attachment file

{{{
nano attachment.txt

This is an attachment
123456
abcdefg
}}}

Use base64 to convert the attachment to base64 encoding:

{{{
base64 attachment.txt > /tmp/attachment
}}}

Now pipe both files to the msmtp command

{{{
cat message.txt /tmp/attachment | msmtp -t
}}}

This successfully sends email with attachment

[[Image(825testemail.png)]]