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Saves all of the message's properties and marks the message as ready to be sent.
The IMessage::SubmitMessage method marks a message as ready to be transmitted. MAPI passes messages to the underlying messaging system in the order in which they are marked for sending. Because of this functionality, a message might stay in a message store for some time before the underlying messaging system can take responsibility for it. The order of receipt at the destination is in the underlying messaging system's control and does not necessarily match the order in which messages were sent.
Call the message's IMAPIProp::SaveChanges method to save it and then check the message's PR_MESSAGE_FLAGS (PidTagMessageFlags) property. If the MSGFLAG_RESEND flag is set, call IMAPISupport::PrepareSubmit. PrepareSubmit updates the recipient type and PR_RESPONSIBILITY (PidTagResponsibility) property for all of the recipients in the resend message.
When SubmitMessage returns, all pointers to the message and its associated subobjects messages, folders, attachments, streams, tables, and so on are no longer valid. MAPI does not permit any further operations on these pointers, except for calling their IUnknown::Release methods. MAPI is designed such that after SubmitMessage is called, you should release the message and all associated subobjects. However, if SubmitMessage returns an error value indicating missing or invalid information, the message remains open and the pointers remain valid.
To cancel a send operation, get and store a pointer to the message's PR_ENTRYID (PidTagEntryId) property before the message is submitted. Because a message's entry identifier is invalidated after the message has been submitted, it is necessary to save it before calling SubmitMessage. To cancel the send, point the lpEntryId parameter to this entry identifier and call IMsgStore::AbortSubmit.