SMTP_TLS=true cause msmtp config error

[terryzwt]

Here is the example env for smtp config.

       - SMTP_AUTHENTICATION=login
       - SMTP_HOST=xx
       - SMTP_PORT=465
       #- SMTP_DOMAIN=
       - SMTP_MAILDOMAIN=examle.com
       - SMTP_USER=no-reply@example.com
       - SMTP_PASS=password
       - SMTP_TLS=true
       - SMTP_STARTTLS=FALSE

This will generated config like this:

### Automatically generated on container start. See documentation on how to set!
account default
host example.com
port 465
domain docker
maildomain example.com
auth login
user no-reply@example.com
password password
tls ON
tls_starttls off
tls_certcheck off

And ERROR:

said into stderr: "msmtp: /etc/msmtprc: line 10: invalid argument ON for command tls"

If I manually change the tls ON to tls on, it works fine.