A reply can be to a single parent.Logical formLearned from3 sentences. A message can be a reply to a single parent.Logical formLearned from3 sentences. (Destination addresses) may pertain-to a reply.Logical formLearned from3 sentences. (Reply commands) may include (destination addresses) of a message.Logical formLearned from3 sentences. (Reply code) may undergo a use.Logical formLearned from3 sentences. Some servers may generate replies.Logical formLearned from3 sentences. A client can be in a reply.Logical formLearned from3 sentences. Some (reply code) may be associated with (message text).Logical formLearned from3 sentences. A (failure reply) may be returned.Logical formLearned from3 sentences. A discussion may apply to a use of (reply code).Logical formLearned from3 sentences. A client may receive some reply.Logical formLearned from3 sentences. (Server implementations) may support some (reply code).Logical formLearned from3 sentences. A smtp-receiver may send some reply.Logical formLearned from3 sentences. Reply can be after some code.Logical formLearned from3 sentences. Some (reply code) may be followed.Logical formLearned from3 sentences.