By coincidence, I emailed a note yesterday morning to GRT and got a response by the afternoon to answer my question. So someone is definitely "at home".
Emails are great ways to communicate, but by their nature, they are convenience oriented in that the sender sends a note when it's convenient for them and the respondant sends a reply when it's convenient for them.
Additionally, even though legitimate emails are rarely filtered out anymore because SPAM filters are getting better, I sometimes don't check my email for a couple of days at a time just because I don't want to have to sit and review all the SPAM to make sure nothing legitimate was blocked.
Telephones, on the other hand shout "Talk to me... NOW" when it rings so if you need an immediate response, the telephone is a better way to go.