The SGTM (Server-side GTM) tag allows you to connect your website/e-shop to your Ecomail email marketing account via a server-side GTM container. The SGTM tag is another way to transfer data from your website/e-shop to your Ecomail account without the need for developer involvement.
Help CZ: https://support.ecomail.cz/cs/articles/10057128-ecomail-sgtm-tag
Help EN: https://support.ecomail.app/en/articles/10067902-ecomail-sgtm-tag