diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2149b72..8afdb04 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Fixed config deserialization issue with `email-hooks` and
   `email-reading-format`.
+- Fixed flags case sensitivity.
 
 ## [0.7.1] - 2023-02-14
 
diff --git a/Cargo.lock b/Cargo.lock
index 8828de9..b152a64 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -775,6 +775,7 @@ version = "0.7.1"
 dependencies = [
  "anyhow",
  "atty",
+ "chrono",
  "clap",
  "clap_complete",
  "clap_mangen",
@@ -803,7 +804,7 @@ dependencies = [
 [[package]]
 name = "himalaya-lib"
 version = "0.6.0"
-source = "git+https://git.sr.ht/~soywod/himalaya-lib?branch=develop#8c538689c9d3098f8e69493791ccbbe52eb9af58"
+source = "git+https://git.sr.ht/~soywod/himalaya-lib?branch=develop#26d3b9e74c978f6dc94689bff809d48fe5ba4c85"
 dependencies = [
  "ammonia",
  "chrono",
@@ -827,7 +828,6 @@ dependencies = [
  "regex",
  "rfc2047-decoder",
  "rusqlite",
- "serde",
  "shellexpand",
  "thiserror",
  "tree_magic",
diff --git a/Cargo.toml b/Cargo.toml
index 3e5690f..7d47001 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,6 +27,7 @@ tempfile = "3.3"
 [dependencies]
 anyhow = "1.0"
 atty = "0.2"
+chrono = "0.4.23"
 clap = "4.0"
 clap_complete = "4.0"
 clap_mangen = "0.2"
diff --git a/src/domain/email/handlers.rs b/src/domain/email/handlers.rs
index 3261a02..c44a35e 100644
--- a/src/domain/email/handlers.rs
+++ b/src/domain/email/handlers.rs
@@ -14,6 +14,7 @@ use uuid::Uuid;
 use crate::{
     printer::{PrintTableOpts, Printer},
     ui::editor,
+    Envelopes,
 };
 
 pub fn attachments<P: Printer, B: Backend + ?Sized>(
@@ -132,10 +133,10 @@ pub fn list<P: Printer, B: Backend + ?Sized>(
     let folder = config.folder_alias(folder)?;
     let page_size = page_size.unwrap_or(config.email_listing_page_size());
     debug!("page size: {}", page_size);
-    let msgs = backend.list_envelopes(&folder, page_size, page)?;
-    trace!("envelopes: {:?}", msgs);
+    let envelopes: Envelopes = backend.list_envelopes(&folder, page_size, page)?.into();
+    trace!("envelopes: {:?}", envelopes);
     printer.print_table(
-        Box::new(msgs),
+        Box::new(envelopes),
         PrintTableOpts {
             format: &config.email_reading_format,
             max_width,
@@ -291,7 +292,9 @@ pub fn search<P: Printer, B: Backend + ?Sized>(
 ) -> Result<()> {
     let folder = config.folder_alias(folder)?;
     let page_size = page_size.unwrap_or(config.email_listing_page_size());
-    let envelopes = backend.search_envelopes(&folder, &query, "", page_size, page)?;
+    let envelopes: Envelopes = backend
+        .search_envelopes(&folder, &query, "", page_size, page)?
+        .into();
     let opts = PrintTableOpts {
         format: &config.email_reading_format,
         max_width,
@@ -313,7 +316,9 @@ pub fn sort<P: Printer, B: Backend + ?Sized>(
 ) -> Result<()> {
     let folder = config.folder_alias(folder)?;
     let page_size = page_size.unwrap_or(config.email_listing_page_size());
-    let envelopes = backend.search_envelopes(&folder, &query, &sort, page_size, page)?;
+    let envelopes: Envelopes = backend
+        .search_envelopes(&folder, &query, &sort, page_size, page)?
+        .into();
     let opts = PrintTableOpts {
         format: &config.email_reading_format,
         max_width,
diff --git a/src/domain/envelope/envelope.rs b/src/domain/envelope/envelope.rs
index a62254f..5c24133 100644
--- a/src/domain/envelope/envelope.rs
+++ b/src/domain/envelope/envelope.rs
@@ -1,6 +1,45 @@
-use himalaya_lib::{Envelope, Flag};
+use chrono::{DateTime, Local};
+use serde::{Serialize, Serializer};
 
-use crate::ui::{Cell, Row, Table};
+use crate::{
+    ui::{Cell, Row, Table},
+    Flag, Flags,
+};
+
+fn date<S: Serializer>(date: &DateTime<Local>, s: S) -> Result<S::Ok, S::Error> {
+    s.serialize_str(&date.to_rfc3339())
+}
+
+#[derive(Clone, Debug, Default, Serialize)]
+pub struct Mailbox {
+    pub name: Option<String>,
+    pub addr: String,
+}
+
+#[derive(Clone, Debug, Default, Serialize)]
+pub struct Envelope {
+    pub id: String,
+    pub flags: Flags,
+    pub subject: String,
+    pub from: Mailbox,
+    #[serde(serialize_with = "date")]
+    pub date: DateTime<Local>,
+}
+
+impl From<&himalaya_lib::Envelope> for Envelope {
+    fn from(envelope: &himalaya_lib::Envelope) -> Self {
+        Envelope {
+            id: envelope.id.clone(),
+            flags: envelope.flags.clone().into(),
+            subject: envelope.subject.clone(),
+            from: Mailbox {
+                name: envelope.from.name.clone(),
+                addr: envelope.from.addr.clone(),
+            },
+            date: envelope.date.clone(),
+        }
+    }
+}
 
 impl Table for Envelope {
     fn head() -> Row {
@@ -14,15 +53,29 @@ impl Table for Envelope {
 
     fn row(&self) -> Row {
         let id = self.id.to_string();
-        let flags = self.flags.to_symbols_string();
         let unseen = !self.flags.contains(&Flag::Seen);
+        let flags = {
+            let mut flags = String::new();
+            flags.push_str(if !unseen { " " } else { "✷" });
+            flags.push_str(if self.flags.contains(&Flag::Answered) {
+                "↵"
+            } else {
+                " "
+            });
+            flags.push_str(if self.flags.contains(&Flag::Flagged) {
+                "⚑"
+            } else {
+                " "
+            });
+            flags
+        };
         let subject = &self.subject;
         let sender = if let Some(name) = &self.from.name {
             name
         } else {
             &self.from.addr
         };
-        let date = self.date.format("%d/%m/%Y %H:%M").to_string();
+        let date = self.date.to_rfc3339();
 
         Row::new()
             .cell(Cell::new(id).bold_if(unseen).red())
diff --git a/src/domain/envelope/envelopes.rs b/src/domain/envelope/envelopes.rs
index 1bbaa31..1842e8b 100644
--- a/src/domain/envelope/envelopes.rs
+++ b/src/domain/envelope/envelopes.rs
@@ -1,11 +1,32 @@
+use std::ops;
+
 use anyhow::Result;
-use himalaya_lib::Envelopes;
+use serde::Serialize;
 
 use crate::{
     printer::{PrintTable, PrintTableOpts, WriteColor},
     ui::Table,
+    Envelope,
 };
 
+/// Represents the list of envelopes.
+#[derive(Clone, Debug, Default, Serialize)]
+pub struct Envelopes(Vec<Envelope>);
+
+impl ops::Deref for Envelopes {
+    type Target = Vec<Envelope>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl From<himalaya_lib::Envelopes> for Envelopes {
+    fn from(envelopes: himalaya_lib::Envelopes) -> Self {
+        Envelopes(envelopes.iter().map(Envelope::from).collect())
+    }
+}
+
 impl PrintTable for Envelopes {
     fn print_table(&self, writer: &mut dyn WriteColor, opts: PrintTableOpts) -> Result<()> {
         writeln!(writer)?;
diff --git a/src/domain/flag/args.rs b/src/domain/flag/args.rs
index 8c476f8..5a660a0 100644
--- a/src/domain/flag/args.rs
+++ b/src/domain/flag/args.rs
@@ -83,7 +83,11 @@ pub fn flags_arg() -> Arg {
     Arg::new(ARG_FLAGS)
         .value_name("FLAGS")
         .help("The flags")
-        .long_help("The list of flags. It can be one of: seen, answered, flagged, deleted, draft, recent. Other flags are considered custom.")
+        .long_help(
+            "The list of flags.
+It can be one of: seen, answered, flagged, deleted, or draft.
+Other flags are considered custom.",
+        )
         .num_args(1..)
         .required(true)
         .last(true)
diff --git a/src/domain/flag/flag.rs b/src/domain/flag/flag.rs
new file mode 100644
index 0000000..d9f2832
--- /dev/null
+++ b/src/domain/flag/flag.rs
@@ -0,0 +1,25 @@
+use serde::Serialize;
+
+/// Represents the flag variants.
+#[derive(Clone, Debug, Eq, Hash, PartialEq, Serialize)]
+pub enum Flag {
+    Seen,
+    Answered,
+    Flagged,
+    Deleted,
+    Draft,
+    Custom(String),
+}
+
+impl From<&himalaya_lib::Flag> for Flag {
+    fn from(flag: &himalaya_lib::Flag) -> Self {
+        match flag {
+            himalaya_lib::Flag::Seen => Flag::Seen,
+            himalaya_lib::Flag::Answered => Flag::Answered,
+            himalaya_lib::Flag::Flagged => Flag::Flagged,
+            himalaya_lib::Flag::Deleted => Flag::Deleted,
+            himalaya_lib::Flag::Draft => Flag::Draft,
+            himalaya_lib::Flag::Custom(flag) => Flag::Custom(flag.clone()),
+        }
+    }
+}
diff --git a/src/domain/flag/flags.rs b/src/domain/flag/flags.rs
new file mode 100644
index 0000000..b413526
--- /dev/null
+++ b/src/domain/flag/flags.rs
@@ -0,0 +1,21 @@
+use serde::Serialize;
+use std::{collections::HashSet, ops};
+
+use crate::Flag;
+
+#[derive(Clone, Debug, Default, Eq, PartialEq, Serialize)]
+pub struct Flags(pub HashSet<Flag>);
+
+impl ops::Deref for Flags {
+    type Target = HashSet<Flag>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl From<himalaya_lib::Flags> for Flags {
+    fn from(flags: himalaya_lib::Flags) -> Self {
+        Flags(flags.iter().map(Flag::from).collect())
+    }
+}
diff --git a/src/domain/flag/mod.rs b/src/domain/flag/mod.rs
index b0b957b..5d92934 100644
--- a/src/domain/flag/mod.rs
+++ b/src/domain/flag/mod.rs
@@ -1,2 +1,8 @@
 pub mod args;
 pub mod handlers;
+
+pub mod flag;
+pub use flag::*;
+
+pub mod flags;
+pub use flags::*;
diff --git a/src/domain/folder/folder.rs b/src/domain/folder/folder.rs
index ba0d931..8e201d2 100644
--- a/src/domain/folder/folder.rs
+++ b/src/domain/folder/folder.rs
@@ -1,7 +1,24 @@
-use himalaya_lib::folder::Folder;
+use serde::Serialize;
 
 use crate::ui::{Cell, Row, Table};
 
+#[derive(Clone, Debug, Default, Serialize)]
+pub struct Folder {
+    pub delim: String,
+    pub name: String,
+    pub desc: String,
+}
+
+impl From<&himalaya_lib::Folder> for Folder {
+    fn from(folder: &himalaya_lib::Folder) -> Self {
+        Folder {
+            delim: folder.delim.clone(),
+            name: folder.name.clone(),
+            desc: folder.desc.clone(),
+        }
+    }
+}
+
 impl Table for Folder {
     fn head() -> Row {
         Row::new()
diff --git a/src/domain/folder/folders.rs b/src/domain/folder/folders.rs
index db34dad..93426d8 100644
--- a/src/domain/folder/folders.rs
+++ b/src/domain/folder/folders.rs
@@ -1,11 +1,31 @@
+use std::ops;
+
 use anyhow::Result;
-use himalaya_lib::folder::Folders;
+use serde::Serialize;
 
 use crate::{
     printer::{PrintTable, PrintTableOpts, WriteColor},
     ui::Table,
+    Folder,
 };
 
+#[derive(Clone, Debug, Default, Serialize)]
+pub struct Folders(Vec<Folder>);
+
+impl ops::Deref for Folders {
+    type Target = Vec<Folder>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl From<himalaya_lib::Folders> for Folders {
+    fn from(folders: himalaya_lib::Folders) -> Self {
+        Folders(folders.iter().map(Folder::from).collect())
+    }
+}
+
 impl PrintTable for Folders {
     fn print_table(&self, writer: &mut dyn WriteColor, opts: PrintTableOpts) -> Result<()> {
         writeln!(writer)?;
diff --git a/src/domain/folder/handlers.rs b/src/domain/folder/handlers.rs
index 85c1516..3fd8e9b 100644
--- a/src/domain/folder/handlers.rs
+++ b/src/domain/folder/handlers.rs
@@ -5,7 +5,10 @@
 use anyhow::Result;
 use himalaya_lib::{AccountConfig, Backend};
 
-use crate::printer::{PrintTableOpts, Printer};
+use crate::{
+    printer::{PrintTableOpts, Printer},
+    Folders,
+};
 
 pub fn expunge<P: Printer, B: Backend + ?Sized>(
     folder: &str,
@@ -22,7 +25,7 @@ pub fn list<P: Printer, B: Backend + ?Sized>(
     printer: &mut P,
     backend: &mut B,
 ) -> Result<()> {
-    let folders = backend.list_folders()?;
+    let folders: Folders = backend.list_folders()?.into();
     printer.print_table(
         // TODO: remove Box
         Box::new(folders),