Ask HN: Should I use my old mailing list?

I was just cleaning out old files on my server when I happened across an old mailing list for my CGI scripts (remember when CGI scripts were a thing?!)

They are all legitimate sign-ups to receive updates from me, but I probably only ever sent out one or two messages. Otherwise it's been unused for over 5 years. To my shock I checked the data file and I have somewhere around 30k people who signed up.

Obviously a good percentage are probably dead emails now. But I was wondering whether I should just trash the file or keep it and perhaps send an email for a related service. My original scripts were all webmaster-related stuff and I do have newer things that I've released.

Just wondering what the wisdom of HN has to say about it?