"Dearest Cousin, I was almost killed today ---"
"Darling, I had the strangest adventure ---"
"I fear I cannot visit you, for I am laid up with a broken leg. Here is what happened --"
"I am stuck in the hospital. Do visit me! Here is what happened --"
Or, given the magical element, "We are currently huddling inside Belvedere Castle, holding out against the fanged squirrels. It all began to go wrong when --"
Or, if you want to do something more sophisticated, check out Steven Brust and Emma Bull's Freedom and Necessity, where I may well have missed the fine philosophical points, but was on the edge of my seat for one character's reaction to a fairly nasty letter that another sent, and where the characters did not write the truth all the time.
Now, pulling this off in rpgs may mean a bit of finessing the interface. That is, batyatoon and I send email to each other deciding what we want to have happen, and then it hits the interface. That is, it becomes an official post on the game mailing list, in character.
This may parallel some of the indie games where a result is determined and then the scene is played out, something that can be fun when everyone is on the same page, or can result in "Where did my roleplaying go?" when they aren't.