EmailXT message types
All EmailXT messages share the same format. However, unlike the current email protocol, there are messages with different purposes. There is still just one type of regular message. However, several other message types can also circulate on the network, usually carrying system information that does not need to be checked by humans. The current message types in use are:
Used for regular communication. This is equivalent to the current email messages.
Sent by a foreign entity when it wants to establish a relationship with you.
Sent automatically by the recipient's EmailXT client when a relationship request arrives without any valid pre-authorization (a passcode).
Sent by the relationship request initiator containing the response to the challenge issued by the recipient.
Automatically sent by the recipient's EmailXT client when the foreign entity has been authorized to communicate.
Sent by the recipient's EmailXT client or any intermediate MTA to report an error or warning condition.
A ticket that confirms the reception of one or more messages. Sent in response to a regular message only.