Postfix/sendmail

[jarmo]

Could someone explain what means this

systemctl status postfix
● postfix.service - Postfix Mail Transport Agent
     Loaded: loaded (/usr/lib/systemd/system/postfix.service; enabled; preset: disabled)
    Drop-In: /usr/lib/systemd/system/service.d
             └─10-timeout-abort.conf
     Active: active (running) since Tue 2025-05-13 11:04:24 EEST; 3s ago
postfix.service enabled preset;disabled?

I can see this in my another system, where sendmail is in use.

I have done
systemctl enable postfix
systemctl start postfix

And same there with sendmail..
This preset is disabled, what that means?

Jarmo