Traditionally, that was the email address for the NTP service at various organisations, in the same way that postmaster was for the mail service.

For those who need more context of who the Time Lords are

The Time Lords are a fictional ancient race of extraterrestrial people in the British science fiction television series Doctor Who. In-universe, they hail from the planet Gallifrey and are stated to have invented time travel technology.

https://en.wikipedia.org/wiki/Time_Lord