Zoho setting for Mail Transfer Agents

Hello,

I am running my Drupal site off an Ubuntu LAMP server and want to add the possibility for the Drupal to send emails (e.g. that come from the Contact form). This needs some sendmail software to be used by php.

I am thinking of trying sSMTP or Postfix (I found sendmail a little too difficult to configure). While the case of relaying through gmail accounts has been described at:
https://techknight.eu/2014/12/09/send-mail-witg-google-smtp-ubuntu-14-04/ (for sSMTP)
https://easyengine.io/tutorials/linux/ubuntu-postfix-gmail-smtp/ (for Postfix)

I couldn't find examples of configuration files for relaying through Zoho.

Do you have any experience with this?

Thanks in advance