diff --git a/CHANGELOG.md b/CHANGELOG.md
index db714a6..76a52aa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `In-Reply-To` not set properly when replying to a message [#323]
 - `Cc` missing or invalid when replying to a message [#324]
 - Notmuch backend hangs [#329]
+- Maildir e2e tests [#335]
+- JSON API for listings [#331]
 
 ## [0.5.8] - 2022-03-04
 
@@ -499,3 +501,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [#323]: https://github.com/soywod/himalaya/issues/323
 [#324]: https://github.com/soywod/himalaya/issues/324
 [#329]: https://github.com/soywod/himalaya/issues/329
+[#331]: https://github.com/soywod/himalaya/issues/331
+[#335]: https://github.com/soywod/himalaya/issues/335
diff --git a/src/backends/imap/imap_envelope.rs b/src/backends/imap/imap_envelope.rs
index 323df8f..d087eb1 100644
--- a/src/backends/imap/imap_envelope.rs
+++ b/src/backends/imap/imap_envelope.rs
@@ -15,13 +15,16 @@ use super::{ImapFlag, ImapFlags};
 
 /// Represents a list of IMAP envelopes.
 #[derive(Debug, Default, serde::Serialize)]
-pub struct ImapEnvelopes(pub Vec<ImapEnvelope>);
+pub struct ImapEnvelopes {
+    #[serde(rename = "response")]
+    pub envelopes: Vec<ImapEnvelope>,
+}
 
 impl Deref for ImapEnvelopes {
     type Target = Vec<ImapEnvelope>;
 
     fn deref(&self) -> &Self::Target {
-        &self.0
+        &self.envelopes
     }
 }
 
@@ -99,7 +102,7 @@ impl TryFrom<RawImapEnvelopes> for ImapEnvelopes {
         for raw_envelope in raw_envelopes.iter().rev() {
             envelopes.push(ImapEnvelope::try_from(raw_envelope).context("cannot parse envelope")?);
         }
-        Ok(Self(envelopes))
+        Ok(Self { envelopes })
     }
 }
 
diff --git a/src/backends/imap/imap_mbox.rs b/src/backends/imap/imap_mbox.rs
index 054c496..223ab6c 100644
--- a/src/backends/imap/imap_mbox.rs
+++ b/src/backends/imap/imap_mbox.rs
@@ -4,6 +4,7 @@
 //! to the mailbox.
 
 use anyhow::Result;
+use serde::Serialize;
 use std::fmt::{self, Display};
 use std::ops::Deref;
 
@@ -16,14 +17,17 @@ use crate::{
 use super::ImapMboxAttrs;
 
 /// Represents a list of IMAP mailboxes.
-#[derive(Debug, Default, serde::Serialize)]
-pub struct ImapMboxes(pub Vec<ImapMbox>);
+#[derive(Debug, Default, Serialize)]
+pub struct ImapMboxes {
+    #[serde(rename = "response")]
+    pub mboxes: Vec<ImapMbox>,
+}
 
 impl Deref for ImapMboxes {
     type Target = Vec<ImapMbox>;
 
     fn deref(&self) -> &Self::Target {
-        &self.0
+        &self.mboxes
     }
 }
 
@@ -130,7 +134,9 @@ pub type RawImapMboxes = imap::types::ZeroCopy<Vec<RawImapMbox>>;
 
 impl<'a> From<RawImapMboxes> for ImapMboxes {
     fn from(raw_mboxes: RawImapMboxes) -> Self {
-        Self(raw_mboxes.iter().map(ImapMbox::from).collect())
+        Self {
+            mboxes: raw_mboxes.iter().map(ImapMbox::from).collect(),
+        }
     }
 }
 
diff --git a/src/backends/maildir/maildir_backend.rs b/src/backends/maildir/maildir_backend.rs
index a52dd13..a2e85a5 100644
--- a/src/backends/maildir/maildir_backend.rs
+++ b/src/backends/maildir/maildir_backend.rs
@@ -151,7 +151,7 @@ impl<'a> Backend<'a> for MaildirBackend<'a> {
         envelopes.sort_by(|a, b| b.date.partial_cmp(&a.date).unwrap());
 
         // Applies pagination boundaries.
-        envelopes.0 = envelopes[page_begin..page_end].to_owned();
+        envelopes.envelopes = envelopes[page_begin..page_end].to_owned();
 
         // Appends envelopes hash to the id mapper cache file and
         // calculates the new short hash length. The short hash length
diff --git a/src/backends/maildir/maildir_envelope.rs b/src/backends/maildir/maildir_envelope.rs
index 17e064c..10cb3be 100644
--- a/src/backends/maildir/maildir_envelope.rs
+++ b/src/backends/maildir/maildir_envelope.rs
@@ -20,19 +20,22 @@ use crate::{
 
 /// Represents a list of envelopes.
 #[derive(Debug, Default, serde::Serialize)]
-pub struct MaildirEnvelopes(pub Vec<MaildirEnvelope>);
+pub struct MaildirEnvelopes {
+    #[serde(rename = "response")]
+    pub envelopes: Vec<MaildirEnvelope>,
+}
 
 impl Deref for MaildirEnvelopes {
     type Target = Vec<MaildirEnvelope>;
 
     fn deref(&self) -> &Self::Target {
-        &self.0
+        &self.envelopes
     }
 }
 
 impl DerefMut for MaildirEnvelopes {
     fn deref_mut(&mut self) -> &mut Self::Target {
-        &mut self.0
+        &mut self.envelopes
     }
 }
 
@@ -114,7 +117,7 @@ impl<'a> TryFrom<RawMaildirEnvelopes> for MaildirEnvelopes {
             envelopes.push(envelope);
         }
 
-        Ok(MaildirEnvelopes(envelopes))
+        Ok(MaildirEnvelopes { envelopes })
     }
 }
 
diff --git a/src/backends/maildir/maildir_mbox.rs b/src/backends/maildir/maildir_mbox.rs
index 946d284..3f2ec2f 100644
--- a/src/backends/maildir/maildir_mbox.rs
+++ b/src/backends/maildir/maildir_mbox.rs
@@ -19,13 +19,16 @@ use crate::{
 
 /// Represents a list of Maildir mailboxes.
 #[derive(Debug, Default, serde::Serialize)]
-pub struct MaildirMboxes(pub Vec<MaildirMbox>);
+pub struct MaildirMboxes {
+    #[serde(rename = "response")]
+    pub mboxes: Vec<MaildirMbox>,
+}
 
 impl Deref for MaildirMboxes {
     type Target = Vec<MaildirMbox>;
 
     fn deref(&self) -> &Self::Target {
-        &self.0
+        &self.mboxes
     }
 }
 
@@ -113,7 +116,7 @@ impl TryFrom<RawMaildirMboxes> for MaildirMboxes {
         for entry in mail_entries {
             mboxes.push(entry?.try_into()?);
         }
-        Ok(MaildirMboxes(mboxes))
+        Ok(MaildirMboxes { mboxes })
     }
 }
 
diff --git a/src/backends/notmuch/notmuch_backend.rs b/src/backends/notmuch/notmuch_backend.rs
index 416e1c0..37e559a 100644
--- a/src/backends/notmuch/notmuch_backend.rs
+++ b/src/backends/notmuch/notmuch_backend.rs
@@ -81,7 +81,7 @@ impl<'a> NotmuchBackend<'a> {
         envelopes.sort_by(|a, b| b.date.partial_cmp(&a.date).unwrap());
 
         // Applies pagination boundaries.
-        envelopes.0 = envelopes[page_begin..page_end].to_owned();
+        envelopes.envelopes = envelopes[page_begin..page_end].to_owned();
 
         // Appends envelopes hash to the id mapper cache file and
         // calculates the new short hash length. The short hash length
@@ -118,17 +118,17 @@ impl<'a> Backend<'a> for NotmuchBackend<'a> {
     fn get_mboxes(&mut self) -> Result<Box<dyn Mboxes>> {
         info!(">> get notmuch virtual mailboxes");
 
-        let mut virt_mboxes: Vec<_> = self
+        let mut mboxes: Vec<_> = self
             .account_config
             .mailboxes
             .iter()
             .map(|(k, v)| NotmuchMbox::new(k, v))
             .collect();
-        trace!("virtual mailboxes: {:?}", virt_mboxes);
-        virt_mboxes.sort_by(|a, b| b.name.partial_cmp(&a.name).unwrap());
+        trace!("virtual mailboxes: {:?}", mboxes);
+        mboxes.sort_by(|a, b| b.name.partial_cmp(&a.name).unwrap());
 
         info!("<< get notmuch virtual mailboxes");
-        Ok(Box::new(NotmuchMboxes(virt_mboxes)))
+        Ok(Box::new(NotmuchMboxes { mboxes }))
     }
 
     fn del_mbox(&mut self, _mbox: &str) -> Result<()> {
@@ -202,7 +202,7 @@ impl<'a> Backend<'a> for NotmuchBackend<'a> {
         // Adds the message to the maildir folder and gets its hash.
         let hash = self
             .mdir
-            .add_msg("inbox", msg, "seen")
+            .add_msg("", msg, "seen")
             .with_context(|| {
                 format!(
                     "cannot add notmuch message to maildir {:?}",
diff --git a/src/backends/notmuch/notmuch_envelope.rs b/src/backends/notmuch/notmuch_envelope.rs
index f7efc45..626d949 100644
--- a/src/backends/notmuch/notmuch_envelope.rs
+++ b/src/backends/notmuch/notmuch_envelope.rs
@@ -19,19 +19,22 @@ use crate::{
 
 /// Represents a list of envelopes.
 #[derive(Debug, Default, serde::Serialize)]
-pub struct NotmuchEnvelopes(pub Vec<NotmuchEnvelope>);
+pub struct NotmuchEnvelopes {
+    #[serde(rename = "response")]
+    pub envelopes: Vec<NotmuchEnvelope>,
+}
 
 impl Deref for NotmuchEnvelopes {
     type Target = Vec<NotmuchEnvelope>;
 
     fn deref(&self) -> &Self::Target {
-        &self.0
+        &self.envelopes
     }
 }
 
 impl DerefMut for NotmuchEnvelopes {
     fn deref_mut(&mut self) -> &mut Self::Target {
-        &mut self.0
+        &mut self.envelopes
     }
 }
 
@@ -107,7 +110,7 @@ impl<'a> TryFrom<RawNotmuchEnvelopes> for NotmuchEnvelopes {
                 .context("cannot parse notmuch mail entry")?;
             envelopes.push(envelope);
         }
-        Ok(NotmuchEnvelopes(envelopes))
+        Ok(NotmuchEnvelopes { envelopes })
     }
 }
 
diff --git a/src/backends/notmuch/notmuch_mbox.rs b/src/backends/notmuch/notmuch_mbox.rs
index 47a6e40..2fe1262 100644
--- a/src/backends/notmuch/notmuch_mbox.rs
+++ b/src/backends/notmuch/notmuch_mbox.rs
@@ -17,13 +17,16 @@ use crate::{
 
 /// Represents a list of Notmuch mailboxes.
 #[derive(Debug, Default, serde::Serialize)]
-pub struct NotmuchMboxes(pub Vec<NotmuchMbox>);
+pub struct NotmuchMboxes {
+    #[serde(rename = "response")]
+    pub mboxes: Vec<NotmuchMbox>,
+}
 
 impl Deref for NotmuchMboxes {
     type Target = Vec<NotmuchMbox>;
 
     fn deref(&self) -> &Self::Target {
-        &self.0
+        &self.mboxes
     }
 }
 
diff --git a/src/mbox/mbox_handlers.rs b/src/mbox/mbox_handlers.rs
index 44881e3..4a110e9 100644
--- a/src/mbox/mbox_handlers.rs
+++ b/src/mbox/mbox_handlers.rs
@@ -115,21 +115,23 @@ mod tests {
                 unimplemented!();
             }
             fn get_mboxes(&mut self) -> Result<Box<dyn Mboxes>> {
-                Ok(Box::new(ImapMboxes(vec![
-                    ImapMbox {
-                        delim: "/".into(),
-                        name: "INBOX".into(),
-                        attrs: ImapMboxAttrs(vec![ImapMboxAttr::NoSelect]),
-                    },
-                    ImapMbox {
-                        delim: "/".into(),
-                        name: "Sent".into(),
-                        attrs: ImapMboxAttrs(vec![
-                            ImapMboxAttr::NoInferiors,
-                            ImapMboxAttr::Custom("HasNoChildren".into()),
-                        ]),
-                    },
-                ])))
+                Ok(Box::new(ImapMboxes {
+                    mboxes: vec![
+                        ImapMbox {
+                            delim: "/".into(),
+                            name: "INBOX".into(),
+                            attrs: ImapMboxAttrs(vec![ImapMboxAttr::NoSelect]),
+                        },
+                        ImapMbox {
+                            delim: "/".into(),
+                            name: "Sent".into(),
+                            attrs: ImapMboxAttrs(vec![
+                                ImapMboxAttr::NoInferiors,
+                                ImapMboxAttr::Custom("HasNoChildren".into()),
+                            ]),
+                        },
+                    ],
+                }))
             }
             fn del_mbox(&mut self, _: &str) -> Result<()> {
                 unimplemented!();
diff --git a/tests/test_maildir_backend.rs b/tests/test_maildir_backend.rs
index d998789..11eaa52 100644
--- a/tests/test_maildir_backend.rs
+++ b/tests/test_maildir_backend.rs
@@ -19,10 +19,7 @@ fn test_maildir_backend() {
 
     // configure accounts
     let account_config = AccountConfig {
-        mailboxes: HashMap::from_iter([
-            ("inbox".into(), "INBOX".into()),
-            ("subdir".into(), "Subdir".into()),
-        ]),
+        mailboxes: HashMap::from_iter([("subdir".into(), "Subdir".into())]),
         ..AccountConfig::default()
     };
     let mdir_config = MaildirBackendConfig {