diff --git a/Cargo.lock b/Cargo.lock
index e2992b7..2f9e5b4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1807,7 +1807,7 @@ dependencies = [
 [[package]]
 name = "imap-codec"
 version = "2.0.0"
-source = "git+https://github.com/superboum/imap-codec?branch=custom/aerogramme#eb37f06a0e8d2543f60063ec80cde9e9dcb150f1"
+source = "git+https://github.com/superboum/imap-codec?branch=custom/aerogramme#990e709450ff4f8986b08d2b84e28f651b74f181"
 dependencies = [
  "abnf-core",
  "base64 0.21.5",
@@ -1834,7 +1834,7 @@ dependencies = [
 [[package]]
 name = "imap-types"
 version = "2.0.0"
-source = "git+https://github.com/superboum/imap-codec?branch=custom/aerogramme#eb37f06a0e8d2543f60063ec80cde9e9dcb150f1"
+source = "git+https://github.com/superboum/imap-codec?branch=custom/aerogramme#990e709450ff4f8986b08d2b84e28f651b74f181"
 dependencies = [
  "base64 0.21.5",
  "bounded-static",
diff --git a/src/imap/index.rs b/src/imap/index.rs
index da94022..44109d5 100644
--- a/src/imap/index.rs
+++ b/src/imap/index.rs
@@ -3,7 +3,7 @@ use std::num::NonZeroU32;
 use anyhow::{anyhow, Result};
 use imap_codec::imap_types::sequence::{SeqOrUid, Sequence, SequenceSet};
 
-use crate::mail::uidindex::{ImapUid, UidIndex};
+use crate::mail::uidindex::{ImapUid, ModSeq, UidIndex};
 use crate::mail::unique_ident::UniqueIdent;
 
 pub struct Index<'a> {
@@ -17,12 +17,10 @@ impl<'a> Index<'a> {
             .iter()
             .enumerate()
             .map(|(i_enum, (&uid, &uuid))| {
-                let flags = internal
+                let (_, modseq, flags) = internal
                     .table
                     .get(&uuid)
-                    .ok_or(anyhow!("mail is missing from index"))?
-                    .2
-                    .as_ref();
+                    .ok_or(anyhow!("mail is missing from index"))?;
                 let i_int: u32 = (i_enum + 1).try_into()?;
                 let i: NonZeroU32 = i_int.try_into()?;
 
@@ -30,6 +28,7 @@ impl<'a> Index<'a> {
                     i,
                     uid,
                     uuid,
+                    modseq: *modseq,
                     flags,
                 })
             })
@@ -134,6 +133,7 @@ pub struct MailIndex<'a> {
     pub i: NonZeroU32,
     pub uid: ImapUid,
     pub uuid: UniqueIdent,
+    pub modseq: ModSeq,
     pub flags: &'a Vec<String>,
 }
 
diff --git a/src/imap/mail_view.rs b/src/imap/mail_view.rs
index eeb6b4b..a8db733 100644
--- a/src/imap/mail_view.rs
+++ b/src/imap/mail_view.rs
@@ -90,6 +90,7 @@ impl<'a> MailView<'a> {
                     Ok(body)
                 }
                 MessageDataItemName::InternalDate => self.internal_date(),
+                MessageDataItemName::ModSeq => Ok(self.modseq()),
             })
             .collect::<Result<Vec<_>, _>>()?;
 
@@ -252,6 +253,10 @@ impl<'a> MailView<'a> {
             .ok_or(anyhow!("Unable to parse internal date"))?;
         Ok(MessageDataItem::InternalDate(DateTime::unvalidated(dt)))
     }
+
+    fn modseq(&self) -> MessageDataItem<'static> {
+        MessageDataItem::ModSeq(self.in_idx.modseq)
+    }
 }
 
 pub enum SeenFlag {