Talk:List of Known World Lines/@comment-96.255.225.148-20190805031047/@comment-16674955-20190805121820

Yes; they travel worldline.

First of all, it isn't possible to send d-mails or any kind of information to the past of the actual worldline. It will always be a new worldline. I guess, not unless the d-mail has a real impact (like Daru's d-mails couldn't change anything).

This isn't the actual "container" that changes, but its inside (the divergence, history, convergence, etc hence if you do something big enough, the divergence will be big enough and the worldline will shift, if you fail in any way or form, the worldline will converge and it doesn't need to change anything, in this example Daru couldn't change the outcome no matter what because even if he sends the setting of the game through d-mail, the sheer difference in ability between him and Faris will still remain too astronomical and so he still loses, the past hasn't changed).

Secondly, the d-mails "stay" in causality. Moeka received her d-mail, Faris father received her d-mail, Luka's mother received his d-mail... the first d-mail that was caught by SERN still exists until your erase it from the databse. The d-mail about the lotto six. The d-mail about Suzuha. Even the nostalgia drive is present in the alpha attractor field if you have ever verified this in the VN. And their consecutive "cancelling" d-mails also stay. Otherwise, there would be no need (or way) to cancel a d-mail in the first place. Why would you tell yourself to ignore last message if it doesn't follow and keep existing? Also take the fact that Faris' and Luka's d-mails changed the IBN's context and position but Moeka still received her own in those worldlines. What do you think happened? She couldn't find it and that's why she was so distressed one of those times Okabe saw her in the "stair alley" place.

The d-mail disappears from your sent folder because technically "it wasn't even sent in the first place". To be more precise, it was sent from a previous iteration/worldline and not this one. But the d-mail will always be received.

Now, if you take, say, the Omega attractor field and Faris' route/end,you'll see that Okabe managed to change attractor field and make sure SERN wouldn't get the message anymore, so he seemingly (at least) saved everyone at the cost of his own relationship with them (the lab doesn't exist in this worldline) so I guess the world keeps the messages it needs for its convergence and "making sense of itself" but I guess it's only my headcanon because we will never have an answer about this.