When sending email invitations through the 1KA system, it is not possible to change the sender's email address, as the message would automatically end up in the spam folder, due to the fact that the email domain (e.g. John@Smith.si) would not match the domain of the survey URL (e.g. mydomain.1ka.si/nameofsurvey).
The same applies if you have customization 1 or 2, which means you have your own sub-domain, by which the system sends the email invitations through the email address of your domain (e.g. firstname.lastname@example.org). It is possible to change the settings of the “reply-to” email address when writing a message to the respondents.
Changing the sender's email address is only possible if the email invitations are sent via an arbitrary mail server (e.g. Gmail or own server).