diff --git a/backend/auth.go b/backend/auth.go
new file mode 100644
index 0000000..271d815
--- /dev/null
+++ b/backend/auth.go
@@ -0,0 +1,58 @@
+package main
+
+import (
+	"math/rand"
+	"time"
+)
+
+type Code struct {
+	Code  string
+	Valid time.Time
+}
+
+type Auth struct {
+	codes map[string]Code
+
+	mailer Mailer
+}
+
+var letterRunes = []rune("abcdefghijklmnopqrstuvwxyz")
+
+func randString(n int) string {
+	b := make([]rune, n)
+	for i := range b {
+		b[i] = letterRunes[rand.Intn(len(letterRunes))]
+	}
+	return string(b)
+}
+
+func (a *Auth) CreateCode(email string) error {
+	code := randString(10)
+
+	if err := a.mailer.SendCode(email, code); err != nil {
+		return err
+	}
+
+	a.codes[email] = Code{
+		Code:  code,
+		Valid: time.Now().Add(time.Minute),
+	}
+
+	return nil
+}
+
+func (a *Auth) IsCodeValid(email string, code string) bool {
+	existingCode, exists := a.codes[email]
+	if !exists {
+		return false
+	}
+
+	return existingCode.Valid.After(time.Now()) && existingCode.Code == code
+}
+
+func NewAuth(mailer Mailer) Auth {
+	return Auth{
+		codes:  make(map[string]Code),
+		mailer: mailer,
+	}
+}
diff --git a/backend/auth_test.go b/backend/auth_test.go
new file mode 100644
index 0000000..bf5e436
--- /dev/null
+++ b/backend/auth_test.go
@@ -0,0 +1,30 @@
+package main
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+type TestMail struct{}
+
+func (m TestMail) SendCode(to string, code string) error {
+	return nil
+}
+
+var testMailer = TestMail{}
+
+func TestCreateCode(t *testing.T) {
+	require := require.New(t)
+
+	auth := NewAuth(testMailer)
+
+	err := auth.CreateCode("test")
+	require.NoError(err)
+
+	code, exists := auth.codes["test"]
+	require.True(exists)
+	require.True(code.Valid.After(time.Now()))
+	require.True(auth.IsCodeValid("test", code.Code))
+}
diff --git a/backend/email.go b/backend/email.go
new file mode 100644
index 0000000..3231bca
--- /dev/null
+++ b/backend/email.go
@@ -0,0 +1,41 @@
+package main
+
+import (
+	"os"
+
+	"github.com/wneessen/go-mail"
+)
+
+type MailClient struct {
+	client *mail.Client
+}
+
+type Mailer interface {
+	SendCode(to string, code string) error
+}
+
+func (m MailClient) getMessage() (*mail.Msg, error) {
+	message := mail.NewMsg()
+	if err := message.From("auth@johncosta.tech"); err != nil {
+		return nil, err
+	}
+
+	return message, nil
+}
+
+func CreateMailClient() (MailClient, error) {
+	client, err := mail.NewClient(
+		"smtp.mailbox.org",
+		mail.WithSMTPAuth(mail.SMTPAuthPlain),
+		mail.WithUsername(os.Getenv("EMAIL_USERNAME")),
+		mail.WithPassword(os.Getenv("EMAIL_PASSWORD")),
+	)
+
+	if err != nil {
+		return MailClient{}, err
+	}
+
+	return MailClient{
+		client: client,
+	}, nil
+}
diff --git a/backend/go.mod b/backend/go.mod
index df64294..1a88d32 100644
--- a/backend/go.mod
+++ b/backend/go.mod
@@ -11,5 +11,8 @@ require (
 	github.com/lib/pq v1.10.9 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/stretchr/testify v1.10.0 // indirect
+	github.com/wneessen/go-mail v0.6.2 // indirect
+	golang.org/x/crypto v0.33.0 // indirect
+	golang.org/x/text v0.22.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/backend/go.sum b/backend/go.sum
index b982fe0..e2ec7d2 100644
--- a/backend/go.sum
+++ b/backend/go.sum
@@ -4,6 +4,7 @@ github.com/go-chi/chi/v5 v5.2.1 h1:KOIHODQj58PmL80G2Eak4WdvUzjSJSm0vG72crDCqb8=
 github.com/go-chi/chi/v5 v5.2.1/go.mod h1:L2yAIGWB3H+phAw1NxKwWM+7eUH/lU8pOMm5hHcoops=
 github.com/go-jet/jet/v2 v2.12.0 h1:z2JfvBAZgsfxlQz6NXBYdZTXc7ep3jhbszTLtETv1JE=
 github.com/go-jet/jet/v2 v2.12.0/go.mod h1:ufQVRQeI1mbcO5R8uCEVcVf3Foej9kReBdwDx7YMWUM=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
@@ -16,6 +17,73 @@ github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsT
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/wneessen/go-mail v0.6.2 h1:c6V7c8D2mz868z9WJ+8zDKtUyLfZ1++uAZmo2GRFji8=
+github.com/wneessen/go-mail v0.6.2/go.mod h1:L/PYjPK3/2ZlNb2/FjEBIn9n1rUWjW+Toy531oVmeb4=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.13.0/go.mod h1:y6Z2r+Rw4iayiXXAIxJIDAJ1zMW4yaTpebo8fPOliYc=
+golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDfU=
+golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
+golang.org/x/crypto v0.33.0 h1:IOBPskki6Lysi0lo9qQvbxiQ+FvsCC/YWOecCHAixus=
+golang.org/x/crypto v0.33.0/go.mod h1:bVdXmD7IV/4GdElGPozy6U7lWdRXA4qyRVGJV57uQ5M=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/mod v0.12.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/mod v0.15.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/mod v0.17.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
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+golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
+golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
+golang.org/x/net v0.15.0/go.mod h1:idbUs1IY1+zTqbi8yxTbhexhEEk5ur9LInksu6HrEpk=
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 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/backend/main.go b/backend/main.go
index b2c57a8..2388930 100644
--- a/backend/main.go
+++ b/backend/main.go
@@ -220,5 +220,8 @@ func main() {
 
 	log.Println("Listening and serving on port 3040.")
 
-	http.ListenAndServe(":3040", r)
+	if err := http.ListenAndServe(":3040", r); err != nil {
+		log.Println(err)
+		return
+	}
 }