Just testing what timestamp I get on this post.
Two years ago, I suddenly received an email from someone I had not heard from in 18 years. It seemed like she just replied to the previous message in the conversation without skipping a beat or telling me where she had been in all that time. I wrote back saying wow, blast from the past, have you been ok?Back about 10 years ago I sent myself a test email. It arrived six months later.
Lol. For what it's worth, mail headers include time send for every step. So if you still have the mail you could try and inspect the headers to see when it was actually send and if it got stuck in some mail queue somewhere for 18 years.