custom postfix configuration (persistent)

Hi everyone,

I get the following mail every day:

This is the mail system at host host.local.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                             The mail system

<host@domain.com>: SMTPUTF8 is required, but was not offered by host
      smtp.domain.com[81.132.234.233]

I searched for this error and found a fix by applying the following fix: https://unix.stackexchange.com…bounce-of-smtputf8-emails

Because openmediavault is managing the `main.cf` of postfix, I cannot apply the fix directly in the config.

I found the following thread touching the same topic. But it seems this is still an old mkconfig fix:

custom postfix configuration for local email

What's the best way of applying custom config entries for postfix with OMV 5?

Thank you votdev !

I had to do a minor correction, after this it was accepted by omv-salt. I will see tomorrow if the email will stop being sent.

Above code runs into error on my version of SaltStack:

salt.exceptions.SaltInvocationError: 'contents' is an invalid keyword argument for 'file.append'

Changing it to the following fixed it:

custom_postfix_smtputf8_enable:
  file.append:
    - name: "/etc/postfix/main.cf"
    - text: smtputf8_enable = no