Yes. I think it's a month.
Messages deleted

I've got messages from 3 years ago and never archived anything, but apparently "diamonds are forever".

I've got messages from 3 years ago and never archived anything, but apparently "diamonds are forever".
Good one! 'Youth's like diamonds in the sun, and diamonds are forever!'
This looks like more one advantage of be a premium member over free accounts like mine.

How do you get them to automatically disappear? I've messages from two years ago that I've never archived and I hardly ever archive any messages anyway.
sftac

No. There is a timeframe. I believe it's stated somewhere when you go to your messages.
Stfac, you have an option to delete, just like regular email.
It's true that if you don't archive a message, after some time it simply disappears?