It's just a personal email domain.
Nothing to see here.
Grot has many meanings. It is a word, a root of other words, various slang words, and an unfortunate surname (pronouncing it Grōt doesn't really help).
But this grot was named after the Grot Shop from the BBC's "The Fall and Rise of Reginald Perrin", a favorite since the 1970s.
It started as the nodename of a UNIX desktop computer cobbled together from prototype parts and spares (hence, the name) while I was at Motorola.
Later, it was larger, equally-cobbled UNIX machine operated from home as a Usenet node and managing some special interest mailing lists.
In 1994, I registered grot.com, and it has been variously hosted ever since.
There used to be a web site here, supporting old mailing lists with additional content along with other personal stuff.
Now, it's just for my email address, the same for more than a quarter century.
However, two of the more popular webs are preserved, below:
Zoomer-list was a mailing list from 1993-1997 and a website.
It was for people who were playing around with Casio's "Zoomer" PDA (aka Z-7000 / XL-7000, Tandy Z-PDA) and later HP's OmniGo, and generally using and abusing PC-GEOS on PDAs and old pen computers.
Launched on the web in 1995, it has to be among the web's earliest fanboi sites.
Ultralite-list was a mailing list from 1991-1997, archived on this website, for people who were playing around with NEC's original Ultralite notebook computer.
What can you do with DOS 3.3, 640K RAM, and 2MB of RAMdisk for C:?
I could send and receive email using MKS Toolkit and UUPC, registered on the UUCP maps, at 2400 baud!