diff --git a/src/imap/command/selected.rs b/src/imap/command/selected.rs
index 1978729..40e75e2 100644
--- a/src/imap/command/selected.rs
+++ b/src/imap/command/selected.rs
@@ -1,13 +1,12 @@
 use std::sync::Arc;
 
-use anyhow::Result;
+use anyhow::{bail, Result};
 use boitalettres::proto::Request;
 use boitalettres::proto::Response;
 use imap_codec::types::command::CommandBody;
-
 use imap_codec::types::flag::{Flag, StoreResponse, StoreType};
 use imap_codec::types::mailbox::Mailbox as MailboxCodec;
-
+use imap_codec::types::response::Code;
 use imap_codec::types::sequence::SequenceSet;
 
 use crate::imap::command::examined;
@@ -91,10 +90,41 @@ impl<'a> SelectedContext<'a> {
 
     async fn copy(
         self,
-        _sequence_set: &SequenceSet,
-        _mailbox: &MailboxCodec,
-        _uid: &bool,
+        sequence_set: &SequenceSet,
+        mailbox: &MailboxCodec,
+        uid: &bool,
     ) -> Result<(Response, flow::Transition)> {
-        Ok((Response::bad("Not implemented")?, flow::Transition::None))
+        let name = String::try_from(mailbox.clone())?;
+
+        let mb_opt = self.user.open_mailbox(&name).await?;
+        let mb = match mb_opt {
+            Some(mb) => mb,
+            None => bail!("Mailbox does not exist"),
+        };
+
+        let (uidval, uid_map) = self.mailbox.copy(sequence_set, mb, uid).await?;
+
+        let copyuid_str = format!(
+            "{} {} {}",
+            uidval,
+            uid_map
+                .iter()
+                .map(|(sid, _)| format!("{}", sid))
+                .collect::<Vec<_>>()
+                .join(","),
+            uid_map
+                .iter()
+                .map(|(_, tuid)| format!("{}", tuid))
+                .collect::<Vec<_>>()
+                .join(",")
+        );
+
+        Ok((
+            Response::ok("COPY completed")?.with_extra_code(Code::Other(
+                "COPYUID".try_into().unwrap(),
+                Some(copyuid_str),
+            )),
+            flow::Transition::None,
+        ))
     }
 }
diff --git a/src/imap/mailbox_view.rs b/src/imap/mailbox_view.rs
index a886c8d..13ea9a7 100644
--- a/src/imap/mailbox_view.rs
+++ b/src/imap/mailbox_view.rs
@@ -168,6 +168,7 @@ impl MailboxView {
             }
         }
 
+        // @TODO: handle _response
         self.update().await
     }
 
@@ -189,6 +190,33 @@ impl MailboxView {
         self.update().await
     }
 
+    pub async fn copy(
+        &self,
+        sequence_set: &SequenceSet,
+        to: Arc<Mailbox>,
+        is_uid_copy: &bool,
+    ) -> Result<(ImapUidvalidity, Vec<(ImapUid, ImapUid)>)> {
+        let mails = self.get_mail_ids(sequence_set, *is_uid_copy)?;
+
+        let mut new_uuids = vec![];
+        for (_i, _uid, uuid) in mails.iter() {
+            new_uuids.push(to.copy_from(&self.mailbox, *uuid).await?);
+        }
+
+        let mut ret = vec![];
+        let to_state = to.current_uid_index().await;
+        for ((_i, uid, _uuid), new_uuid) in mails.iter().zip(new_uuids.iter()) {
+            let dest_uid = to_state
+                .table
+                .get(new_uuid)
+                .ok_or(anyhow!("copied mail not in destination mailbox"))?
+                .0;
+            ret.push((*uid, dest_uid));
+        }
+
+        Ok((to_state.uidvalidity, ret))
+    }
+
     /// Looks up state changes in the mailbox and produces a set of IMAP
     /// responses describing the new state.
     pub async fn fetch(
@@ -841,21 +869,6 @@ fn build_imap_email_struct<'a>(msg: &Message<'a>, part: &MessagePart<'a>) -> Res
     }
 }
 
-fn count_lines(mut text: &[u8]) -> Result<u32> {
-    while text.first().map(u8::is_ascii_whitespace).unwrap_or(false) {
-        text = &text[1..];
-    }
-    while text.last().map(u8::is_ascii_whitespace).unwrap_or(false) {
-        text = &text[..text.len() - 1];
-    }
-    if text.is_empty() {
-        Ok(0)
-    } else {
-        let nlf = text.iter().filter(|x| **x == b'\n').count();
-        Ok(u32::try_from(1 + nlf)?)
-    }
-}
-
 fn try_collect_shime<T>(acc: Result<Vec<T>>, elem: Result<T>) -> Result<Vec<T>> {
     match (acc, elem) {
         (Err(e), _) | (_, Err(e)) => Err(e),
diff --git a/src/mail/mailbox.rs b/src/mail/mailbox.rs
index 44ffe20..df7ede9 100644
--- a/src/mail/mailbox.rs
+++ b/src/mail/mailbox.rs
@@ -138,7 +138,7 @@ impl Mailbox {
 
     /// Copy an email from an other Mailbox to this mailbox
     /// (use this when possible, as it allows for a certain number of storage optimizations)
-    pub async fn copy_from(&self, from: &Mailbox, uuid: UniqueIdent) -> Result<()> {
+    pub async fn copy_from(&self, from: &Mailbox, uuid: UniqueIdent) -> Result<UniqueIdent> {
         if self.id == from.id {
             bail!("Cannot copy into same mailbox");
         }
@@ -412,9 +412,14 @@ impl MailboxInternal {
         Ok(())
     }
 
-    async fn copy_from(&mut self, from: &MailboxInternal, source_id: UniqueIdent) -> Result<()> {
+    async fn copy_from(
+        &mut self,
+        from: &MailboxInternal,
+        source_id: UniqueIdent,
+    ) -> Result<UniqueIdent> {
         let new_id = gen_ident();
-        self.copy_internal(from, source_id, new_id).await
+        self.copy_internal(from, source_id, new_id).await?;
+        Ok(new_id)
     }
 
     async fn move_from(&mut self, from: &mut MailboxInternal, id: UniqueIdent) -> Result<()> {