diff --git a/Cargo.lock b/Cargo.lock
index 642edbd..2e5849e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -7,13 +7,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78d1833b3838dbe990df0f1f87baf640cf6146e898166afe401839d1b001e570"
 dependencies = [
  "bitflags",
- "bytes",
+ "bytes 0.5.6",
  "futures-core",
  "futures-sink",
  "log",
  "pin-project 0.4.27",
- "tokio",
- "tokio-util",
+ "tokio 0.2.24",
+ "tokio-util 0.3.1",
 ]
 
 [[package]]
@@ -50,7 +50,7 @@ dependencies = [
  "base64 0.13.0",
  "bitflags",
  "brotli2",
- "bytes",
+ "bytes 0.5.6",
  "cookie",
  "copyless",
  "derive_more",
@@ -61,7 +61,7 @@ dependencies = [
  "futures-core",
  "futures-util",
  "fxhash",
- "h2",
+ "h2 0.2.7",
  "http",
  "httparse",
  "indexmap",
@@ -117,7 +117,7 @@ dependencies = [
  "futures-channel",
  "futures-util",
  "smallvec",
- "tokio",
+ "tokio 0.2.24",
 ]
 
 [[package]]
@@ -133,7 +133,7 @@ dependencies = [
  "futures-channel",
  "futures-util",
  "log",
- "mio",
+ "mio 0.6.23",
  "mio-uds",
  "num_cpus",
  "slab",
@@ -201,7 +201,7 @@ dependencies = [
  "actix-rt",
  "actix-service",
  "bitflags",
- "bytes",
+ "bytes 0.5.6",
  "either",
  "futures-channel",
  "futures-sink",
@@ -230,7 +230,7 @@ dependencies = [
  "actix-utils",
  "actix-web-codegen",
  "awc",
- "bytes",
+ "bytes 0.5.6",
  "derive_more",
  "encoding_rs",
  "futures-channel",
@@ -311,12 +311,29 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "anyhow"
+version = "1.0.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "afddf7f520a80dbf76e6f50a35bca42a2331ef227a28b3b6dc5c2e2338d114b1"
+
 [[package]]
 name = "arrayvec"
 version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
 
+[[package]]
+name = "async-channel"
+version = "1.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59740d83946db6a5af71ae25ddf9562c2b176b2ca42cf99a455f09f4a220d6b9"
+dependencies = [
+ "concurrent-queue",
+ "event-listener",
+ "futures-core",
+]
+
 [[package]]
 name = "async-trait"
 version = "0.1.42"
@@ -354,7 +371,7 @@ dependencies = [
  "actix-rt",
  "actix-service",
  "base64 0.13.0",
- "bytes",
+ "bytes 0.5.6",
  "cfg-if 1.0.0",
  "derive_more",
  "futures-core",
@@ -497,15 +514,27 @@ version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0e4cec68f03f32e44924783795810fa50a7035d8c8ebe78580ad7e6c703fba38"
 
+[[package]]
+name = "bytes"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b700ce4376041dcd0a327fd0097c41095743c4c8af8887265942faf1100bd040"
+
 [[package]]
 name = "bytestring"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fc7c05fa5172da78a62d9949d662d2ac89d4cc7355d7b49adee5163f1fb3f363"
 dependencies = [
- "bytes",
+ "bytes 0.5.6",
 ]
 
+[[package]]
+name = "cache-padded"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "631ae5198c9be5e753e5cc215e1bd73c2b466a3565173db433f52bb9d3e66dba"
+
 [[package]]
 name = "cargo_metadata"
 version = "0.12.1"
@@ -558,6 +587,15 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "concurrent-queue"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "30ed07550be01594c6026cff2a1d7fe9c8f683caa798e12b68694ac9e88286a3"
+dependencies = [
+ "cache-padded",
+]
+
 [[package]]
 name = "config"
 version = "0.10.1"
@@ -658,6 +696,26 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "data-encoding"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "993a608597367c6377b258c25d7120740f00ed23a2252b729b1932dd7866f908"
+
+[[package]]
+name = "deadpool"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d126179d86aee4556e54f5f3c6bf6d9884e7cc52cef82f77ee6f90a7747616d"
+dependencies = [
+ "async-trait",
+ "config",
+ "crossbeam-queue",
+ "num_cpus",
+ "serde",
+ "tokio 1.0.2",
+]
+
 [[package]]
 name = "derive_more"
 version = "0.99.11"
@@ -739,6 +797,12 @@ dependencies = [
  "regex",
 ]
 
+[[package]]
+name = "event-listener"
+version = "2.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7531096570974c3a9dcf9e4b8e1cede1ec26cf5046219fb3b9d897503b9be59"
+
 [[package]]
 name = "fake"
 version = "2.3.0"
@@ -754,6 +818,15 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
 
+[[package]]
+name = "fastrand"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca5faf057445ce5c9d4329e382b2ce7ca38550ef3b73a5348362d5f24e0c7fe3"
+dependencies = [
+ "instant",
+]
+
 [[package]]
 name = "flate2"
 version = "1.0.19"
@@ -852,6 +925,21 @@ version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "611834ce18aaa1bd13c4b374f5d653e1027cf99b6b502584ff8c9a64413b30bb"
 
+[[package]]
+name = "futures-lite"
+version = "1.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4481d0cd0de1d204a4fa55e7d45f07b1d958abcb06714b3446438e2eff695fb"
+dependencies = [
+ "fastrand",
+ "futures-core",
+ "futures-io",
+ "memchr",
+ "parking",
+ "pin-project-lite 0.2.0",
+ "waker-fn",
+]
+
 [[package]]
 name = "futures-macro"
 version = "0.3.8"
@@ -879,6 +967,12 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "futures-timer"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e64b03909df88034c26dc1547e8970b91f98bdb65165d6a4e9110d94263dbb2c"
+
 [[package]]
 name = "futures-util"
 version = "0.3.8"
@@ -984,7 +1078,7 @@ version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e4728fd124914ad25e99e3d15a9361a879f6620f63cb56bbb08f95abb97a535"
 dependencies = [
- "bytes",
+ "bytes 0.5.6",
  "fnv",
  "futures-core",
  "futures-sink",
@@ -992,8 +1086,28 @@ dependencies = [
  "http",
  "indexmap",
  "slab",
- "tokio",
- "tokio-util",
+ "tokio 0.2.24",
+ "tokio-util 0.3.1",
+ "tracing",
+ "tracing-futures",
+]
+
+[[package]]
+name = "h2"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6b67e66362108efccd8ac053abafc8b7a8d86a37e6e48fc4f6f7485eb5e9e6a5"
+dependencies = [
+ "bytes 1.0.1",
+ "fnv",
+ "futures-core",
+ "futures-sink",
+ "futures-util",
+ "http",
+ "indexmap",
+ "slab",
+ "tokio 1.0.2",
+ "tokio-util 0.6.1",
  "tracing",
  "tracing-futures",
 ]
@@ -1067,7 +1181,7 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "84129d298a6d57d246960ff8eb831ca4af3f96d29e2e28848dae275408658e26"
 dependencies = [
- "bytes",
+ "bytes 0.5.6",
  "fnv",
  "itoa",
 ]
@@ -1078,10 +1192,42 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13d5ff830006f7646652e057693569bfe0d51760c0085a071769d142a205111b"
 dependencies = [
- "bytes",
+ "bytes 0.5.6",
  "http",
 ]
 
+[[package]]
+name = "http-body"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2861bd27ee074e5ee891e8b539837a9430012e249d7f0ca2d795650f579c1994"
+dependencies = [
+ "bytes 1.0.1",
+ "http",
+]
+
+[[package]]
+name = "http-types"
+version = "2.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2ab8d0085fb82859c9adf050bd53992297ecdd03a665a230dfa50c8c964bf3d"
+dependencies = [
+ "anyhow",
+ "async-channel",
+ "base64 0.13.0",
+ "cookie",
+ "futures-lite",
+ "http",
+ "infer",
+ "pin-project-lite 0.1.11",
+ "rand",
+ "serde",
+ "serde_json",
+ "serde_qs",
+ "serde_urlencoded",
+ "url",
+]
+
 [[package]]
 name = "httparse"
 version = "1.3.4"
@@ -1100,19 +1246,43 @@ version = "0.13.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f6ad767baac13b44d4529fcf58ba2cd0995e36e7b435bc5b039de6f47e880dbf"
 dependencies = [
- "bytes",
+ "bytes 0.5.6",
  "futures-channel",
  "futures-core",
  "futures-util",
- "h2",
+ "h2 0.2.7",
  "http",
- "http-body",
+ "http-body 0.3.1",
  "httparse",
  "httpdate",
  "itoa",
  "pin-project 1.0.2",
  "socket2",
- "tokio",
+ "tokio 0.2.24",
+ "tower-service",
+ "tracing",
+ "want",
+]
+
+[[package]]
+name = "hyper"
+version = "0.14.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12219dc884514cb4a6a03737f4413c0e01c23a1b059b0156004b23f1e19dccbe"
+dependencies = [
+ "bytes 1.0.1",
+ "futures-channel",
+ "futures-core",
+ "futures-util",
+ "h2 0.3.0",
+ "http",
+ "http-body 0.4.0",
+ "httparse",
+ "httpdate",
+ "itoa",
+ "pin-project 1.0.2",
+ "socket2",
+ "tokio 1.0.2",
  "tower-service",
  "tracing",
  "want",
@@ -1124,12 +1294,12 @@ version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "37743cc83e8ee85eacfce90f2f4102030d9ff0a95244098d781e9bee4a90abb6"
 dependencies = [
- "bytes",
+ "bytes 0.5.6",
  "futures-util",
- "hyper",
+ "hyper 0.13.9",
  "log",
  "rustls",
- "tokio",
+ "tokio 0.2.24",
  "tokio-rustls",
  "webpki",
 ]
@@ -1155,6 +1325,12 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "infer"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "64e9829a50b42bb782c1df523f78d332fe371b10c661e78b7a3c34b0198e9fac"
+
 [[package]]
 name = "instant"
 version = "0.1.9"
@@ -1376,12 +1552,25 @@ dependencies = [
  "kernel32-sys",
  "libc",
  "log",
- "miow",
+ "miow 0.2.2",
  "net2",
  "slab",
  "winapi 0.2.8",
 ]
 
+[[package]]
+name = "mio"
+version = "0.7.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e50ae3f04d169fcc9bde0b547d1c205219b7157e07ded9c5aff03e0637cb3ed7"
+dependencies = [
+ "libc",
+ "log",
+ "miow 0.3.6",
+ "ntapi",
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "mio-uds"
 version = "0.6.8"
@@ -1390,7 +1579,7 @@ checksum = "afcb699eb26d4332647cc848492bbc15eafb26f08d0304550d5aa1f612e066f0"
 dependencies = [
  "iovec",
  "libc",
- "mio",
+ "mio 0.6.23",
 ]
 
 [[package]]
@@ -1405,6 +1594,16 @@ dependencies = [
  "ws2_32-sys",
 ]
 
+[[package]]
+name = "miow"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a33c1b55807fbed163481b5ba66db4b2fa6cde694a5027be10fb724206c5897"
+dependencies = [
+ "socket2",
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "net2"
 version = "0.2.37"
@@ -1439,6 +1638,15 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "ntapi"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f6bb902e437b6d86e03cce10a7e2af662292c5dfef23b65899ea3ac9354ad44"
+dependencies = [
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "num-integer"
 version = "0.1.44"
@@ -1492,6 +1700,12 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
 
+[[package]]
+name = "parking"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "427c3892f9e783d91cc128285287e70a59e206ca452770ece88a76f7a3eddd72"
+
 [[package]]
 name = "parking_lot"
 version = "0.11.1"
@@ -1777,13 +1991,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0718f81a8e14c4dbb3b34cf23dc6aaf9ab8a0dfec160c534b3dbca1aaa21f47c"
 dependencies = [
  "base64 0.13.0",
- "bytes",
+ "bytes 0.5.6",
  "encoding_rs",
  "futures-core",
  "futures-util",
  "http",
- "http-body",
- "hyper",
+ "http-body 0.3.1",
+ "hyper 0.13.9",
  "hyper-rustls",
  "ipnet",
  "js-sys",
@@ -1797,7 +2011,7 @@ dependencies = [
  "serde",
  "serde_json",
  "serde_urlencoded",
- "tokio",
+ "tokio 0.2.24",
  "tokio-rustls",
  "url",
  "wasm-bindgen",
@@ -1966,6 +2180,18 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_qs"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5af82de3c6549b001bec34961ff2d6a54339a87bab37ce901b693401f27de6cb"
+dependencies = [
+ "data-encoding",
+ "percent-encoding",
+ "serde",
+ "thiserror",
+]
+
 [[package]]
 name = "serde_urlencoded"
 version = "0.7.0"
@@ -2104,7 +2330,7 @@ dependencies = [
  "base64 0.13.0",
  "bitflags",
  "byteorder",
- "bytes",
+ "bytes 0.5.6",
  "chrono",
  "crc",
  "crossbeam-channel",
@@ -2175,7 +2401,7 @@ dependencies = [
  "actix-rt",
  "actix-threadpool",
  "once_cell",
- "tokio",
+ "tokio 0.2.24",
  "tokio-rustls",
 ]
 
@@ -2384,14 +2610,14 @@ version = "0.2.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "099837d3464c16a808060bb3f02263b412f6fafcb5d01c533d309985fbeebe48"
 dependencies = [
- "bytes",
+ "bytes 0.5.6",
  "fnv",
  "futures-core",
  "iovec",
  "lazy_static",
  "libc",
  "memchr",
- "mio",
+ "mio 0.6.23",
  "mio-uds",
  "num_cpus",
  "pin-project-lite 0.1.11",
@@ -2401,6 +2627,20 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "tokio"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ca04cec6ff2474c638057b65798f60ac183e5e79d3448bb7163d36a39cff6ec"
+dependencies = [
+ "autocfg",
+ "bytes 1.0.1",
+ "libc",
+ "memchr",
+ "mio 0.7.7",
+ "pin-project-lite 0.2.0",
+]
+
 [[package]]
 name = "tokio-macros"
 version = "0.2.6"
@@ -2420,22 +2660,48 @@ checksum = "e12831b255bcfa39dc0436b01e19fea231a37db570686c06ee72c423479f889a"
 dependencies = [
  "futures-core",
  "rustls",
- "tokio",
+ "tokio 0.2.24",
  "webpki",
 ]
 
+[[package]]
+name = "tokio-stream"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76066865172052eb8796c686f0b441a93df8b08d40a950b062ffb9a426f00edd"
+dependencies = [
+ "futures-core",
+ "pin-project-lite 0.2.0",
+ "tokio 1.0.2",
+]
+
 [[package]]
 name = "tokio-util"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "be8242891f2b6cbef26a2d7e8605133c2c554cd35b3e4948ea892d6d68436499"
 dependencies = [
- "bytes",
+ "bytes 0.5.6",
  "futures-core",
  "futures-sink",
  "log",
  "pin-project-lite 0.1.11",
- "tokio",
+ "tokio 0.2.24",
+]
+
+[[package]]
+name = "tokio-util"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12ae4751faa60b9f96dd8344d74592e5a17c0c9a220413dbc6942d14139bbfcc"
+dependencies = [
+ "bytes 1.0.1",
+ "futures-core",
+ "futures-sink",
+ "log",
+ "pin-project-lite 0.2.0",
+ "tokio 1.0.2",
+ "tokio-stream",
 ]
 
 [[package]]
@@ -2576,7 +2842,7 @@ dependencies = [
  "rand",
  "smallvec",
  "thiserror",
- "tokio",
+ "tokio 0.2.24",
  "url",
 ]
 
@@ -2596,7 +2862,7 @@ dependencies = [
  "resolv-conf",
  "smallvec",
  "thiserror",
- "tokio",
+ "tokio 0.2.24",
  "trust-dns-proto",
 ]
 
@@ -2679,6 +2945,7 @@ dependencies = [
  "idna",
  "matches",
  "percent-encoding",
+ "serde",
 ]
 
 [[package]]
@@ -2718,6 +2985,12 @@ version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
 
+[[package]]
+name = "waker-fn"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d5b2c62b4012a3e1eca5a7e077d13b3bf498c4073e33ccd58626607748ceeca"
+
 [[package]]
 name = "want"
 version = "0.3.0"
@@ -2914,6 +3187,26 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "wiremock"
+version = "0.4.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9297d85d701557878bb9b768b048f464874b8c287b1426499f385f804817db1"
+dependencies = [
+ "async-trait",
+ "deadpool",
+ "futures",
+ "futures-timer",
+ "http-types",
+ "hyper 0.14.2",
+ "log",
+ "once_cell",
+ "regex",
+ "serde",
+ "serde_json",
+ "tokio 1.0.2",
+]
+
 [[package]]
 name = "ws2_32-sys"
 version = "0.2.1"
@@ -2955,8 +3248,9 @@ dependencies = [
  "reqwest",
  "serde",
  "serde-aux",
+ "serde_json",
  "sqlx",
- "tokio",
+ "tokio 0.2.24",
  "tracing",
  "tracing-actix-web",
  "tracing-bunyan-formatter",
@@ -2966,4 +3260,5 @@ dependencies = [
  "unicode-segmentation",
  "uuid",
  "validator",
+ "wiremock",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 09aa013..e9bdb3d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -38,3 +38,5 @@ claim = "0.4.0"
 quickcheck = "0.9.2"
 quickcheck_macros = "0.9.1"
 fake = "~2.3.0"
+wiremock = "0.4.7"
+serde_json = "1.0.61"
diff --git a/configuration/base.yaml b/configuration/base.yaml
index 885fa69..0c6780b 100644
--- a/configuration/base.yaml
+++ b/configuration/base.yaml
@@ -9,4 +9,6 @@ database:
   database_name: "newsletter"
   require_ssl: false
 email_client:
-  base_url: "localhost"
\ No newline at end of file
+  base_url: "localhost"
+  sender_email: "test@gmail.com"
+  authorization_token: "my-secret-token"
\ No newline at end of file
diff --git a/src/configuration.rs b/src/configuration.rs
index ad89e28..79752e6 100644
--- a/src/configuration.rs
+++ b/src/configuration.rs
@@ -1,3 +1,4 @@
+use crate::domain::SubscriberEmail;
 use serde_aux::field_attributes::deserialize_number_from_string;
 use sqlx::postgres::{PgConnectOptions, PgSslMode};
 use std::convert::{TryFrom, TryInto};
@@ -50,6 +51,14 @@ impl DatabaseSettings {
 #[derive(serde::Deserialize)]
 pub struct EmailClientSettings {
     pub base_url: String,
+    pub sender_email: String,
+    pub authorization_token: String,
+}
+
+impl EmailClientSettings {
+    pub fn sender(&self) -> Result<SubscriberEmail, String> {
+        SubscriberEmail::parse(self.sender_email.clone())
+    }
 }
 
 pub fn get_configuration() -> Result<Settings, config::ConfigError> {
diff --git a/src/email_client.rs b/src/email_client.rs
index dc51bd9..dc0217c 100644
--- a/src/email_client.rs
+++ b/src/email_client.rs
@@ -4,13 +4,17 @@ use reqwest::Client;
 pub struct EmailClient {
     http_client: Client,
     base_url: String,
+    sender: SubscriberEmail,
+    authorization_token: String,
 }
 
 impl EmailClient {
-    pub fn new(base_url: String) -> Self {
+    pub fn new(base_url: String, sender: SubscriberEmail, authorization_token: String) -> Self {
         Self {
             http_client: Client::new(),
             base_url,
+            sender,
+            authorization_token,
         }
     }
 
@@ -20,7 +24,89 @@ impl EmailClient {
         subject: &str,
         html_content: &str,
         text_content: &str,
-    ) -> Result<(), String> {
-        todo!()
+    ) -> Result<(), reqwest::Error> {
+        let url = format!("{}/email", self.base_url);
+        let request_body = SendEmailRequest {
+            from: self.sender.as_ref().to_owned(),
+            to: recipient.as_ref().to_owned(),
+            subject: subject.into(),
+            html_body: html_content.into(),
+            text_body: text_content.into(),
+        };
+        self.http_client
+            .post(&url)
+            .header("X-Postmark-Server-Token", &self.authorization_token)
+            .json(&request_body)
+            .send()
+            .await?;
+        Ok(())
+    }
+}
+
+#[derive(serde::Serialize)]
+#[serde(rename_all = "PascalCase")]
+struct SendEmailRequest {
+    from: String,
+    to: String,
+    subject: String,
+    html_body: String,
+    text_body: String,
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::domain::SubscriberEmail;
+    use crate::email_client::EmailClient;
+    use fake::faker::internet::en::SafeEmail;
+    use fake::faker::lorem::en::{Paragraph, Sentence};
+    use fake::{Fake, Faker};
+    use wiremock::matchers::{header, header_exists, method, path};
+    use wiremock::{Mock, MockServer, Request, ResponseTemplate};
+
+    struct SendEmailBodyMatcher;
+
+    impl wiremock::Match for SendEmailBodyMatcher {
+        fn matches(&self, request: &Request) -> bool {
+            let result: Result<serde_json::Value, _> = serde_json::from_slice(&request.body);
+            if let Ok(body) = result {
+                dbg!(&body);
+                body.get("From").is_some()
+                    && body.get("To").is_some()
+                    && body.get("Subject").is_some()
+                    && body.get("HtmlBody").is_some()
+                    && body.get("TextBody").is_some()
+            } else {
+                false
+            }
+        }
+    }
+
+    #[actix_rt::test]
+    async fn send_email_fires_a_request_to_base_url() {
+        // Arrange
+        let mock_server = MockServer::start().await;
+        let sender = SubscriberEmail::parse(SafeEmail().fake()).unwrap();
+        let email_client = EmailClient::new(mock_server.uri(), sender, Faker.fake());
+
+        let subscriber_email = SubscriberEmail::parse(SafeEmail().fake()).unwrap();
+        let subject: String = Sentence(1..2).fake();
+        let content: String = Paragraph(1..10).fake();
+
+        Mock::given(header_exists("X-Postmark-Server-Token"))
+            .and(header("Content-Type", "application/json"))
+            .and(path("/email"))
+            .and(method("POST"))
+            .and(SendEmailBodyMatcher)
+            .respond_with(ResponseTemplate::new(200))
+            .expect(1)
+            .mount(&mock_server)
+            .await;
+
+        // Act
+        let _ = email_client
+            .send_email(subscriber_email, &subject, &content, &content)
+            .await;
+
+        // Assert
     }
 }
diff --git a/src/main.rs b/src/main.rs
index f68a351..081de94 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -16,7 +16,16 @@ async fn main() -> std::io::Result<()> {
         .connect_with(configuration.database.with_db())
         .await
         .expect("Failed to connect to Postgres.");
-    let email_client = EmailClient::new(configuration.email_client.base_url);
+
+    let sender_email = configuration
+        .email_client
+        .sender()
+        .expect("Invalid sender email address.");
+    let email_client = EmailClient::new(
+        configuration.email_client.base_url,
+        sender_email,
+        configuration.email_client.authorization_token,
+    );
 
     let address = format!(
         "{}:{}",
diff --git a/tests/health_check.rs b/tests/health_check.rs
index 97af0c5..4041625 100644
--- a/tests/health_check.rs
+++ b/tests/health_check.rs
@@ -33,7 +33,16 @@ async fn spawn_app() -> TestApp {
     let mut configuration = get_configuration().expect("Failed to read configuration.");
     configuration.database.database_name = Uuid::new_v4().to_string();
     let connection_pool = configure_database(&configuration.database).await;
-    let email_client = EmailClient::new(configuration.email_client.base_url);
+
+    let sender_email = configuration
+        .email_client
+        .sender()
+        .expect("Invalid sender email address.");
+    let email_client = EmailClient::new(
+        configuration.email_client.base_url,
+        sender_email,
+        configuration.email_client.authorization_token,
+    );
 
     let server =
         run(listener, connection_pool.clone(), email_client).expect("Failed to bind address");