I see that best-practice for domains using email should have a webmaster account (and the other normal accounts), but what if you don't have any email addresses for that domain? We have our primary business domain, but then we have subsites for other venues that are under our our control as well. For instance the primary business is mainvenue.com. We also have parkvenue.com, yearlyevent.com, and majorevent.com (run every few years). Do I need a webmaster email setup for each of these domains? Also what if we have a domain that just redirects to our main website (e.g. secondaryvenue.com points to mainvenue.com/secondaryvenue). In all cases the contact email for employees are employee@mainvenue.com. Any assistance would be appreciated.
Are webmaster accounts required for non-email domains?
domains;email;email accounts
The webmaster@ convention is simply a device where people might be contactable through a generic email address.  It has nothing to do with using or not using email on a domain.  My experience is that it was more widely used  a few years ago than these days because it was thought to be a method to contact domain owners. I the past I would set up webmaster@, postmaster@ and info@ for every domain, even if I didn't use the address.  Over time I realised that in fact they never receive email and if they do it is spam, so I have stopped doing it.