18. The method of claim 2 , further comprising: receiving a response to the request electronic message, the response including the prior electronic message that was requested in the request electronic message; obtaining a set of information pertaining to the prior electronic message; accessing the electronic message conversation data structure; and updating the electronic message conversation data structure to include the set of information pertaining to the prior electronic message.
2. The method of claim 1 , further comprising: determining whether the electronic message conversation data structure is missing information pertaining to a prior electronic message that is known to have been sent in the electronic message conversation prior to the received electronic message; and in response to determining that the electronic message conversation data structure is missing information pertaining to the prior electronic message, sending a request electronic message to a human participant of the electronic message conversation to request that the prior electronic message be sent again.