diff --git a/CHANGELOG.md b/CHANGELOG.md
index dbfc889..5dccd19 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Move feature [#31]
 - Delete feature [#36]
 - Signature support [#33]
+- Add attachment(s) to a message [#37]
 
 ### Changed
 
@@ -92,6 +93,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [#33]: https://github.com/soywod/himalaya/issues/33
 [#34]: https://github.com/soywod/himalaya/issues/34
 [#35]: https://github.com/soywod/himalaya/issues/35
+[#37]: https://github.com/soywod/himalaya/issues/37
 [#38]: https://github.com/soywod/himalaya/issues/38
 [#39]: https://github.com/soywod/himalaya/issues/39
 [#40]: https://github.com/soywod/himalaya/issues/40
diff --git a/Cargo.lock b/Cargo.lock
index ab4bb28..1f7c464 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -21,7 +21,7 @@ version = "0.7.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7404febffaa47dac81aa44dba71523c9d069b1bdc50a77db41195149e17f68e5"
 dependencies = [
- "memchr",
+ "memchr 2.3.4",
 ]
 
 [[package]]
@@ -183,6 +183,15 @@ dependencies = [
  "vec_map",
 ]
 
+[[package]]
+name = "cloudabi"
+version = "0.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
+dependencies = [
+ "bitflags",
+]
+
 [[package]]
 name = "core-foundation"
 version = "0.9.1"
@@ -218,6 +227,12 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "fixedbitset"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37ab347416e802de484e4d03c7316c48f1ecb56574dfd4a46a80f173ce1de04d"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -256,12 +271,29 @@ dependencies = [
  "wasi 0.9.0+wasi-snapshot-preview1",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9495705279e7140bf035dde1f6e750c162df8b625267cd52cc44e0b156732c8"
+dependencies = [
+ "cfg-if 1.0.0",
+ "libc",
+ "wasi 0.10.0+wasi-snapshot-preview1",
+]
+
 [[package]]
 name = "gimli"
 version = "0.23.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f6503fe142514ca4799d4c26297c4248239fe8838d827db6bd6065c6ed29a6ce"
 
+[[package]]
+name = "hashbrown"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d7afe4a420e3fe79967a00898cc1f4db7c8a49a9333a29f8a4bd76a253d5cd04"
+
 [[package]]
 name = "hermit-abi"
 version = "0.1.17"
@@ -286,6 +318,7 @@ dependencies = [
  "serde_json",
  "terminal_size",
  "toml",
+ "tree_magic",
  "uuid",
 ]
 
@@ -377,6 +410,16 @@ dependencies = [
  "nom 5.1.2",
 ]
 
+[[package]]
+name = "indexmap"
+version = "1.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "824845a0bf897a9042383849b02c1bc219c2383772efcd5c6f9766fa4b81aef3"
+dependencies = [
+ "autocfg",
+ "hashbrown",
+]
+
 [[package]]
 name = "instant"
 version = "0.1.9"
@@ -406,9 +449,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "lettre"
-version = "0.10.0-alpha.4"
+version = "0.10.0-beta.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dc8c2fc7873920aca23647e5e86d44ff3f40bbc5a5efaab445c9eb0e001c9f71"
+checksum = "897171ed0e63da84c988b157106ad8b6532d7499aeeec906ce46b05415cc79d3"
 dependencies = [
  "base64 0.13.0",
  "hostname",
@@ -420,10 +463,8 @@ dependencies = [
  "once_cell",
  "quoted_printable",
  "r2d2",
- "rand",
+ "rand 0.8.3",
  "regex",
- "serde",
- "serde_json",
  "uuid",
 ]
 
@@ -446,6 +487,15 @@ version = "0.2.88"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "03b07a082330a35e43f63177cc01689da34fbffa0105e1246cf0311472cac73a"
 
+[[package]]
+name = "lock_api"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c4da24a77a3d8a6d4862d95f72e6fdb9c09a643ecdb402d754004a557f2bec75"
+dependencies = [
+ "scopeguard",
+]
+
 [[package]]
 name = "lock_api"
 version = "0.4.2"
@@ -487,6 +537,15 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
 
+[[package]]
+name = "memchr"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "148fab2e51b4f1cfc66da2a7c32981d1d3c083a803978268bb11fe4b86925e7a"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "memchr"
 version = "2.3.4"
@@ -527,6 +586,15 @@ dependencies = [
  "tempfile",
 ]
 
+[[package]]
+name = "nom"
+version = "3.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05aec50c70fd288702bcd93284a8444607f3292dbdf2a30de5ea5dcdbe72287b"
+dependencies = [
+ "memchr 1.0.2",
+]
+
 [[package]]
 name = "nom"
 version = "5.1.2"
@@ -534,7 +602,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ffb4262d26ed83a1c0a33a38fe2bb15797329c85770da05e6b828ddb782627af"
 dependencies = [
  "lexical-core",
- "memchr",
+ "memchr 2.3.4",
  "version_check",
 ]
 
@@ -545,7 +613,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "88034cfd6b4a0d54dd14f4a507eceee36c0b70e5a02236c4e4df571102be17f0"
 dependencies = [
  "bitvec",
- "memchr",
+ "memchr 2.3.4",
  "version_check",
 ]
 
@@ -613,6 +681,16 @@ dependencies = [
  "vcpkg",
 ]
 
+[[package]]
+name = "parking_lot"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3a704eb390aafdc107b0e392f56a82b668e3a71366993b5340f5833fd62505e"
+dependencies = [
+ "lock_api 0.3.4",
+ "parking_lot_core 0.7.2",
+]
+
 [[package]]
 name = "parking_lot"
 version = "0.11.1"
@@ -620,8 +698,22 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6d7744ac029df22dca6284efe4e898991d28e3085c706c972bcd7da4a27a15eb"
 dependencies = [
  "instant",
- "lock_api",
- "parking_lot_core",
+ "lock_api 0.4.2",
+ "parking_lot_core 0.8.2",
+]
+
+[[package]]
+name = "parking_lot_core"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d58c7c768d4ba344e3e8d72518ac13e259d7c7ade24167003b8488e10b6740a3"
+dependencies = [
+ "cfg-if 0.1.10",
+ "cloudabi",
+ "libc",
+ "redox_syscall",
+ "smallvec",
+ "winapi",
 ]
 
 [[package]]
@@ -644,6 +736,16 @@ version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"
 
+[[package]]
+name = "petgraph"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "467d164a6de56270bd7c4d070df81d07beace25012d5103ced4e9ff08d6afdb7"
+dependencies = [
+ "fixedbitset",
+ "indexmap",
+]
+
 [[package]]
 name = "pkg-config"
 version = "0.3.19"
@@ -687,7 +789,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "545c5bc2b880973c9c10e4067418407a0ccaa3091781d1671d46eb35107cb26f"
 dependencies = [
  "log",
- "parking_lot",
+ "parking_lot 0.11.1",
  "scheduled-thread-pool",
 ]
 
@@ -703,11 +805,23 @@ version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
 dependencies = [
- "getrandom",
+ "getrandom 0.1.15",
  "libc",
- "rand_chacha",
- "rand_core",
- "rand_hc",
+ "rand_chacha 0.2.2",
+ "rand_core 0.5.1",
+ "rand_hc 0.2.0",
+]
+
+[[package]]
+name = "rand"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ef9e7e66b4468674bfcb0c81af8b7fa0bb154fa9f28eb840da5c447baeb8d7e"
+dependencies = [
+ "libc",
+ "rand_chacha 0.3.0",
+ "rand_core 0.6.2",
+ "rand_hc 0.3.0",
 ]
 
 [[package]]
@@ -717,7 +831,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.5.1",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e12735cf05c9e10bf21534da50a147b924d555dc7a547c42e6bb2d5b6017ae0d"
+dependencies = [
+ "ppv-lite86",
+ "rand_core 0.6.2",
 ]
 
 [[package]]
@@ -726,7 +850,16 @@ version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
 dependencies = [
- "getrandom",
+ "getrandom 0.1.15",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34cf66eb183df1c5876e2dcf6b13d57340741e8dc255b48e40a26de954d06ae7"
+dependencies = [
+ "getrandom 0.2.2",
 ]
 
 [[package]]
@@ -735,7 +868,16 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
 dependencies = [
- "rand_core",
+ "rand_core 0.5.1",
+]
+
+[[package]]
+name = "rand_hc"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3190ef7066a446f2e7f42e239d161e905420ccab01eb967c9eb27d21b2322a73"
+dependencies = [
+ "rand_core 0.6.2",
 ]
 
 [[package]]
@@ -751,7 +893,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "38cf2c13ed4745de91a5eb834e11c00bcc3709e773173b2ce4c56c9fbde04b9c"
 dependencies = [
  "aho-corasick",
- "memchr",
+ "memchr 2.3.4",
  "regex-syntax",
  "thread_local",
 ]
@@ -810,7 +952,7 @@ version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc6f74fd1204073fa02d5d5d68bec8021be4c38690b61264b2fdb48083d0e7d7"
 dependencies = [
- "parking_lot",
+ "parking_lot 0.11.1",
 ]
 
 [[package]]
@@ -916,7 +1058,7 @@ checksum = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
 dependencies = [
  "cfg-if 0.1.10",
  "libc",
- "rand",
+ "rand 0.7.3",
  "redox_syscall",
  "remove_dir_all",
  "winapi",
@@ -985,6 +1127,19 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "tree_magic"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1d99367ce3e553a84738f73bd626ccca541ef90ae757fdcdc4cbe728e6cb629"
+dependencies = [
+ "fnv",
+ "lazy_static",
+ "nom 3.2.1",
+ "parking_lot 0.10.2",
+ "petgraph",
+]
+
 [[package]]
 name = "unicase"
 version = "2.6.0"
@@ -1030,7 +1185,7 @@ version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9fde2f6a4bea1d6e007c4ad38c6839fa71cbb63b6dbf5b595aa38dc9b1093c11"
 dependencies = [
- "rand",
+ "rand 0.7.3",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 25ed7bc..4e0e2da 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ edition = "2018"
 clap = "2.33.3"
 error-chain = "0.12.4"
 imap = "2.4.0"
-lettre = "0.10.0-alpha.4"
+lettre = "0.10.0-beta.3"
 mailparse = "0.13.1"
 native-tls = "0.2"
 rfc2047-decoder = "0.1.2"
@@ -17,4 +17,5 @@ serde = { version = "1.0.118", features = ["derive"] }
 serde_json = "1.0.61"
 terminal_size = "0.1.15"
 toml = "0.5.8"
+tree_magic = "0.2.3"
 uuid = { version = "0.8", features = ["v4"] }
diff --git a/src/msg/cli.rs b/src/msg/cli.rs
index bfa5929..44a42a6 100644
--- a/src/msg/cli.rs
+++ b/src/msg/cli.rs
@@ -56,6 +56,16 @@ fn page_arg<'a>() -> Arg<'a, 'a> {
         .default_value("0")
 }
 
+fn attachment_arg<'a>() -> Arg<'a, 'a> {
+    Arg::with_name("attachments")
+        .help("Adds attachment to the message")
+        .short("a")
+        .long("attachment")
+        .value_name("PATH")
+        .multiple(true)
+        .takes_value(true)
+}
+
 pub fn msg_subcmds<'a>() -> Vec<App<'a, 'a>> {
     vec![
         SubCommand::with_name("list")
@@ -75,7 +85,9 @@ pub fn msg_subcmds<'a>() -> Vec<App<'a, 'a>> {
                     .multiple(true)
                     .required(true),
             ),
-        SubCommand::with_name("write").about("Writes a new message"),
+        SubCommand::with_name("write")
+            .about("Writes a new message")
+            .arg(attachment_arg()),
         SubCommand::with_name("send")
             .about("Sends a raw message")
             .arg(Arg::with_name("message").raw(true)),
@@ -247,10 +259,16 @@ pub fn msg_matches(matches: &ArgMatches) -> Result<()> {
             break;
         }
 
-        if let Some(_) = matches.subcommand_matches("write") {
+        if let Some(matches) = matches.subcommand_matches("write") {
+            let attachments = matches
+                .values_of("attachments")
+                .unwrap_or_default()
+                .map(String::from)
+                .collect::<Vec<_>>();
             let tpl = Msg::build_new_tpl(&config, &account)?;
             let content = input::open_editor_with_tpl(tpl.to_string().as_bytes())?;
             let mut msg = Msg::from(content);
+            msg.attachments = attachments;
 
             loop {
                 match input::post_edit_choice() {
@@ -317,6 +335,11 @@ pub fn msg_matches(matches: &ArgMatches) -> Result<()> {
         }
 
         if let Some(matches) = matches.subcommand_matches("reply") {
+            let attachments = matches
+                .values_of("attachments")
+                .unwrap_or_default()
+                .map(String::from)
+                .collect::<Vec<_>>();
             let uid = matches.value_of("uid").unwrap();
 
             let msg = Msg::from(imap_conn.read_msg(&mbox, &uid)?);
@@ -328,6 +351,7 @@ pub fn msg_matches(matches: &ArgMatches) -> Result<()> {
 
             let content = input::open_editor_with_tpl(&tpl.to_string().as_bytes())?;
             let mut msg = Msg::from(content);
+            msg.attachments = attachments;
 
             loop {
                 match input::post_edit_choice() {
@@ -360,12 +384,18 @@ pub fn msg_matches(matches: &ArgMatches) -> Result<()> {
         }
 
         if let Some(matches) = matches.subcommand_matches("forward") {
+            let attachments = matches
+                .values_of("attachments")
+                .unwrap_or_default()
+                .map(String::from)
+                .collect::<Vec<_>>();
             let uid = matches.value_of("uid").unwrap();
 
             let msg = Msg::from(imap_conn.read_msg(&mbox, &uid)?);
             let tpl = msg.build_forward_tpl(&config, &account)?;
             let content = input::open_editor_with_tpl(&tpl.to_string().as_bytes())?;
             let mut msg = Msg::from(content);
+            msg.attachments = attachments;
 
             loop {
                 match input::post_edit_choice() {
diff --git a/src/msg/model.rs b/src/msg/model.rs
index 31c5523..1e8bac0 100644
--- a/src/msg/model.rs
+++ b/src/msg/model.rs
@@ -6,7 +6,8 @@ use serde::{
     ser::{self, SerializeStruct},
     Serialize,
 };
-use std::{fmt, result};
+use std::{borrow::Cow, fmt, fs, path::PathBuf, result};
+use tree_magic;
 use uuid::Uuid;
 
 use crate::config::model::{Account, Config};
@@ -171,25 +172,6 @@ impl<'a> ReadableMsg {
 
 // Message
 
-// #[derive(Debug, Serialize, PartialEq)]
-// #[serde(rename_all = "lowercase")]
-// pub enum Flag {
-//     Seen,
-//     Answered,
-//     Flagged,
-// }
-
-// impl Flag {
-//     fn from_imap_flag(flag: &imap::types::Flag<'_>) -> Option<Self> {
-//         match flag {
-//             imap::types::Flag::Seen => Some(Self::Seen),
-//             imap::types::Flag::Answered => Some(Self::Answered),
-//             imap::types::Flag::Flagged => Some(Self::Flagged),
-//             _ => None,
-//         }
-//     }
-// }
-
 #[derive(Debug, Serialize)]
 pub struct Msg<'m> {
     pub uid: u32,
@@ -197,7 +179,8 @@ pub struct Msg<'m> {
     pub subject: String,
     pub sender: String,
     pub date: String,
-
+    #[serde(skip_serializing)]
+    pub attachments: Vec<String>,
     #[serde(skip_serializing)]
     raw: Vec<u8>,
 }
@@ -210,6 +193,7 @@ impl<'m> From<Vec<u8>> for Msg<'m> {
             subject: String::from(""),
             sender: String::from(""),
             date: String::from(""),
+            attachments: vec![],
             raw,
         }
     }
@@ -242,6 +226,7 @@ impl<'m> From<&'m imap::types::Fetch> for Msg<'m> {
                     .internal_date()
                     .map(|date| date.naive_local().to_string())
                     .unwrap_or_default(),
+                attachments: vec![],
                 raw: fetch.body().unwrap_or_default().to_vec(),
             },
         }
@@ -263,52 +248,85 @@ impl<'m> Msg<'m> {
     }
 
     pub fn to_sendable_msg(&self) -> Result<lettre::Message> {
-        use lettre::message::header::{ContentTransferEncoding, ContentType};
-        use lettre::message::{Message, SinglePart};
+        use lettre::message::{
+            header::*,
+            {Body, Message, MultiPart, SinglePart},
+        };
 
         let parsed = self.parse()?;
-        let msg = parsed
-            .headers
-            .iter()
-            .fold(Message::builder(), |msg, h| {
-                let value = String::from_utf8(h.get_value_raw().to_vec())
-                    .unwrap()
-                    .replace("\r", "");
+        let msg_builder = parsed.headers.iter().fold(Message::builder(), |msg, h| {
+            let value = String::from_utf8(h.get_value_raw().to_vec())
+                .unwrap()
+                .replace("\r", "");
 
-                match h.get_key().to_lowercase().as_str() {
-                    "in-reply-to" => msg.in_reply_to(value.parse().unwrap()),
-                    "from" => match value.parse() {
-                        Ok(addr) => msg.from(addr),
+            match h.get_key().to_lowercase().as_str() {
+                "in-reply-to" => msg.in_reply_to(value.parse().unwrap()),
+                "from" => match value.parse() {
+                    Ok(addr) => msg.from(addr),
+                    Err(_) => msg,
+                },
+                "to" => value
+                    .split(",")
+                    .fold(msg, |msg, addr| match addr.trim().parse() {
+                        Ok(addr) => msg.to(addr),
                         Err(_) => msg,
-                    },
-                    "to" => value
-                        .split(",")
-                        .fold(msg, |msg, addr| match addr.trim().parse() {
-                            Ok(addr) => msg.to(addr),
-                            Err(_) => msg,
-                        }),
-                    "cc" => value
-                        .split(",")
-                        .fold(msg, |msg, addr| match addr.trim().parse() {
-                            Ok(addr) => msg.cc(addr),
-                            Err(_) => msg,
-                        }),
-                    "bcc" => value
-                        .split(",")
-                        .fold(msg, |msg, addr| match addr.trim().parse() {
-                            Ok(addr) => msg.bcc(addr),
-                            Err(_) => msg,
-                        }),
-                    "subject" => msg.subject(value),
-                    _ => msg,
-                }
-            })
-            .singlepart(
-                SinglePart::builder()
-                    .header(ContentType("text/plain; charset=utf-8".parse().unwrap()))
-                    .header(ContentTransferEncoding::Base64)
-                    .body(parsed.get_body_raw()?),
-            )?;
+                    }),
+                "cc" => value
+                    .split(",")
+                    .fold(msg, |msg, addr| match addr.trim().parse() {
+                        Ok(addr) => msg.cc(addr),
+                        Err(_) => msg,
+                    }),
+                "bcc" => value
+                    .split(",")
+                    .fold(msg, |msg, addr| match addr.trim().parse() {
+                        Ok(addr) => msg.bcc(addr),
+                        Err(_) => msg,
+                    }),
+                "subject" => msg.subject(value),
+                _ => msg,
+            }
+        });
+
+        let text_part = SinglePart::builder()
+            .header(ContentType("text/plain; charset=utf-8".parse().unwrap()))
+            .header(ContentTransferEncoding::Base64)
+            .body(parsed.get_body_raw()?);
+
+        let msg = if self.attachments.is_empty() {
+            msg_builder.singlepart(text_part)
+        } else {
+            let mut parts = MultiPart::mixed().singlepart(text_part);
+
+            for attachment in &self.attachments {
+                let attachment_name = PathBuf::from(attachment);
+                let attachment_name = attachment_name
+                    .file_name()
+                    .map(|fname| fname.to_string_lossy())
+                    .unwrap_or(Cow::from(Uuid::new_v4().to_string()));
+                let attachment_content = fs::read(attachment)
+                    .chain_err(|| format!("Cannot read attachment `{}`", attachment))?;
+                let attachment_ctype = tree_magic::from_u8(&attachment_content);
+
+                parts = parts.singlepart(
+                    SinglePart::builder()
+                        .header(ContentType(attachment_ctype.parse().chain_err(|| {
+                            format!("Could not parse content type `{}`", attachment_ctype)
+                        })?))
+                        .header(ContentDisposition {
+                            disposition: DispositionType::Attachment,
+                            parameters: vec![DispositionParam::Filename(
+                                Charset::Ext("utf-8".into()),
+                                None,
+                                attachment_name.as_bytes().into(),
+                            )],
+                        })
+                        .body(Body::new(attachment_content)),
+                );
+            }
+
+            msg_builder.multipart(parts)
+        }?;
 
         Ok(msg)
     }