diff --git a/geneit_backend/Cargo.lock b/geneit_backend/Cargo.lock
index f04cac2..e216052 100644
--- a/geneit_backend/Cargo.lock
+++ b/geneit_backend/Cargo.lock
@@ -302,6 +302,12 @@ version = "1.0.71"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c7d0618f0e0b7e8ff11427422b64564d5fb0be1940354bfe2e0529b18a9d9b8"
 
+[[package]]
+name = "ascii_utils"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "71938f30533e4d95a6d17aa530939da3842c2ab6f4f84b9dae68447e4129f74a"
+
 [[package]]
 name = "autocfg"
 version = "1.1.0"
@@ -570,6 +576,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "fast_chemail"
+version = "0.9.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "495a39d30d624c2caabe6312bfead73e7717692b44e0b32df168c275a2e8e9e4"
+dependencies = [
+ "ascii_utils",
+]
+
 [[package]]
 name = "flate2"
 version = "1.0.26"
@@ -650,6 +665,7 @@ dependencies = [
  "env_logger",
  "lazy_static",
  "log",
+ "mailchecker",
  "serde",
 ]
 
@@ -868,6 +884,16 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "mailchecker"
+version = "5.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c64fa7af9860896bdfe496f323ac278f256006fd248dd7730e37c5faa648b05"
+dependencies = [
+ "fast_chemail",
+ "once_cell",
+]
+
 [[package]]
 name = "memchr"
 version = "2.5.0"
diff --git a/geneit_backend/Cargo.toml b/geneit_backend/Cargo.toml
index 3ca33cd..3411579 100644
--- a/geneit_backend/Cargo.toml
+++ b/geneit_backend/Cargo.toml
@@ -14,4 +14,5 @@ anyhow = "1.0.71"
 actix-web = "4.3.1"
 diesel = { version = "2.0.4", features = ["postgres"] }
 serde = { version = "1.0.163", features = ["derive"] }
-actix-remote-ip = "0.1.0"
\ No newline at end of file
+actix-remote-ip = "0.1.0"
+mailchecker = "5.0.9"
\ No newline at end of file
diff --git a/geneit_backend/src/controllers/auth_controller.rs b/geneit_backend/src/controllers/auth_controller.rs
index 51f4d7a..be86373 100644
--- a/geneit_backend/src/controllers/auth_controller.rs
+++ b/geneit_backend/src/controllers/auth_controller.rs
@@ -17,7 +17,10 @@ pub async fn create_account(
 ) -> actix_web::Result<HttpResponse> {
     // TODO : rate limiting
 
-    // TODO : check if email is valid
+    // Check if email is valid
+    if !mailchecker::is_valid(&req.email) {
+        return Ok(HttpResponse::BadRequest().json("Email address is invalid!"));
+    }
 
     // Check parameters
     let constraints = StaticConstraints::default();