We have a registered domain with SaudiNIC and we want to know the e-mail address of the domain’s administrative contact?

SaudiNIC does not disclose its customers’ private information. However, if the purpose is to verify whether the e-mail address registered with us or not, then you may wish to use the tool (Guide me) provided within your SaudiNIC’s account. It will not display the full e-mail address, but it will give a some hint.