just use a calendar event, it's more robust, and gives you the same feeling of 'oh yea...'
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Whereas I have notes-to-future-me on my calendar that I put there 30 years ago.
I think I sent one of those "mails to the future" in the 90's, asking 2002 me how I am. I don't think it ever arrived, or the free email domain I was using ceased operating.
Sheesh, anyone old enough to remember the services offering a free email address with a choice of maybe 50 domains in a dropdown?
Mail.com is still around and offers a lot of domains, though I think the amount of domains has reduced over the years.