There are opportunities from time to time for a player to speak with the DM privately, such is the way of cross and double-cross, secret abilities, secret items, for thieves' inventories and other occasions. Therefore I would ask Alice to distribute Misha's email to Yuyla and Cat for that purpose unless there is anther preferred way. Even the act of sending the message should be secret.

Additionally, you are free to conspire against the DM using your encrypted thread or email, though it's not typically wise to cross the DM, surprise attacks against enemies I control would then be possible, though it would necessarily exclude Ashley.