src/imap/mail_view.rs

@@ -74,7 +74,12 @@ impl<'a> MailView<'a> {
                 MessageDataItemName::Rfc822Size => self.rfc_822_size(),
                 MessageDataItemName::Rfc822Header => self.rfc_822_header(),
                 MessageDataItemName::Rfc822Text => self.rfc_822_text(),
-                MessageDataItemName::Rfc822 => self.rfc822(),
+                MessageDataItemName::Rfc822 => {
+                    if self.is_not_yet_seen() {
+                        seen = SeenFlag::MustAdd;
+                    }
+                    self.rfc822()
+                },
                 MessageDataItemName::Envelope => Ok(self.envelope()),
                 MessageDataItemName::Body => self.body(),
                 MessageDataItemName::BodyStructure => self.body_structure(),
@@ -189,6 +194,11 @@ impl<'a> MailView<'a> {
         )?))
     }
 
+    fn is_not_yet_seen(&self) -> bool {
+        let seen_flag = Flag::Seen.to_string();
+        !self.in_idx.flags.iter().any(|x| *x == seen_flag)
+    }
+
     /// maps to BODY[<section>]<<partial>> and BODY.PEEK[<section>]<<partial>>
     /// peek does not implicitly set the \Seen flag
     /// eg. BODY[HEADER.FIELDS (DATE FROM)]
@@ -201,8 +211,7 @@ impl<'a> MailView<'a> {
     ) -> Result<(MessageDataItem<'static>, SeenFlag)> {
         // Manage Seen flag
         let mut seen = SeenFlag::DoNothing;
-        let seen_flag = Flag::Seen.to_string();
+        if !peek && self.is_not_yet_seen() {
-        if !peek && !self.in_idx.flags.iter().any(|x| *x == seen_flag) {
             // Add \Seen flag
             //self.mailbox.add_flags(uuid, &[seen_flag]).await?;
             seen = SeenFlag::MustAdd;

src/imap/mailbox_view.rs

@@ -1,7 +1,7 @@
 use std::num::NonZeroU32;
 use std::sync::Arc;
 
-use anyhow::{anyhow, Error, Result};
+use anyhow::{anyhow, Error, Context, Result};
 
 use futures::stream::{FuturesOrdered, StreamExt};
 
@@ -130,6 +130,7 @@ impl MailboxView {
         data.extend(self.flags_status()?.into_iter());
         data.push(self.uidvalidity_status()?);
         data.push(self.uidnext_status()?);
+        self.unseen_first_status()?.map(|unseen_status| data.push(unseen_status));
 
         Ok(data)
     }
@@ -400,6 +401,22 @@ impl MailboxView {
         Ok(Body::Data(Data::Recent(self.recent()?)))
     }
 
+    fn unseen_first_status(&self) -> Result<Option<Body<'static>>> {
+        Ok(self.unseen_first()?.map(|unseen_id| {
+            Status::ok(None, Some(Code::Unseen(unseen_id)), "First unseen.").map(Body::Status)
+        }).transpose()?)
+    }
+
+    fn unseen_first(&self) -> Result<Option<NonZeroU32>> {
+        Ok(self.0.snapshot.table
+            .values()
+            .enumerate()
+            .find(|(_i, (_imap_uid, flags))| {
+                !flags.contains(&"\\Seen".to_string())
+            }).map(|(i, _)| NonZeroU32::try_from(i as u32 + 1))
+            .transpose()?)
+    }
+
     pub(crate) fn recent(&self) -> Result<u32> {
         let recent = self
             .0