You can send email to jdt at this domain. I also get emails through ucsc and uwaterloo (jtracey and j3tracey respectively), which you can use if it's something academically related.
I also have a twitter account @jtga_d that I use sometimes, and a few mastodon accounts:
A CrySP account, for anything related to my research.
An OpenStreetMap account, for things relevant to my mapping hobbies.
A general account, for everything else.
I also tend to keep a pretty close eye on my GitHub account.
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