diff --git a/.gitignore b/.gitignore
index 0063918..88aec54 100644
--- a/.gitignore
+++ b/.gitignore
@@ -32,6 +32,8 @@ src/main/resources/.env
 *.bak
 *.swo
 
+src/main/resources/application.properties
+
 
 
 
diff --git a/build.gradle b/build.gradle
index b12e231..77a7619 100644
--- a/build.gradle
+++ b/build.gradle
@@ -37,6 +37,10 @@ dependencies {
     compileOnly 'org.projectlombok:lombok'
     annotationProcessor 'org.projectlombok:lombok'
 
+    // Spring mail
+    implementation 'org.springframework.boot:spring-boot-starter-mail'
+    implementation 'com.sun.mail:jakarta.mail:2.0.1'
+
     // Testing
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     testImplementation 'org.springframework.security:spring-security-test'
diff --git a/src/main/java/dongguk/osori/domain/user/EmailService.java b/src/main/java/dongguk/osori/domain/user/EmailService.java
new file mode 100644
index 0000000..f7f8854
--- /dev/null
+++ b/src/main/java/dongguk/osori/domain/user/EmailService.java
@@ -0,0 +1,76 @@
+package dongguk.osori.domain.user;
+
+import jakarta.mail.internet.MimeMessage;
+import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.data.redis.core.ValueOperations;
+import org.springframework.mail.javamail.JavaMailSender;
+import org.springframework.stereotype.Service;
+
+import java.util.concurrent.TimeUnit;
+
+@Service
+@RequiredArgsConstructor
+public class EmailService {
+
+    private final JavaMailSender javaMailSender;
+    private final RedisTemplate<String, String> redisTemplate;
+
+    @Value("${spring.mail.username}")
+    private String senderEmail;
+
+    private static final long CODE_EXPIRE_MINUTES = 5; // 인증 코드 유효 시간 (5분)
+
+    // 인증 번호 생성
+    public static int createNumber() {
+        return (int)(Math.random() * 900000) + 100000; // 6자리 랜덤 숫자
+    }
+
+    // 이메일 작성
+    public MimeMessage createMail(String recipientEmail, int authCode) {
+        MimeMessage message = javaMailSender.createMimeMessage();
+
+        try {
+            message.setFrom(senderEmail);
+            message.setRecipients(MimeMessage.RecipientType.TO, recipientEmail);
+            message.setSubject("[Osori] 회원가입을 위한 이메일 인증");
+
+            // 이메일 본문
+            String body = "<h1>안녕하세요. Osori입니다.</h1>"
+                    + "<h3>회원가입을 위한 요청하신 인증 번호입니다.</h3>"
+                    + "<div align='center' style='border:1px solid black; font-family:verdana;'>"
+                    + "<h2>회원가입 인증 코드입니다.</h2>"
+                    + "<h1 style='color:blue'>" + authCode + "</h1>"
+                    + "</div>"
+                    + "<br><h3>감사합니다.</h3>";
+
+            message.setText(body, "UTF-8", "html");
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        return message;
+    }
+
+    // 이메일 전송 및 Redis 저장
+    public void sendEmail(String recipientEmail) {
+        int authCode = createNumber();
+        MimeMessage message = createMail(recipientEmail, authCode);
+
+        // Redis에 인증 코드 저장, 5분 후 만료
+        ValueOperations<String, String> valueOperations = redisTemplate.opsForValue();
+        valueOperations.set(recipientEmail, String.valueOf(authCode), CODE_EXPIRE_MINUTES, TimeUnit.MINUTES);
+
+        // 이메일 전송
+        javaMailSender.send(message);
+    }
+
+    // 인증 코드 확인
+    public boolean verifyAuthCode(String email, String inputCode) {
+        ValueOperations<String, String> valueOperations = redisTemplate.opsForValue();
+        String storedCode = valueOperations.get(email);
+
+        return storedCode != null && storedCode.equals(inputCode);
+    }
+}
diff --git a/src/main/java/dongguk/osori/domain/user/UserController.java b/src/main/java/dongguk/osori/domain/user/UserController.java
index 11dad40..6b0ac2a 100644
--- a/src/main/java/dongguk/osori/domain/user/UserController.java
+++ b/src/main/java/dongguk/osori/domain/user/UserController.java
@@ -1,5 +1,6 @@
 package dongguk.osori.domain.user;
 
+import dongguk.osori.domain.user.dto.EmailVerificationDto;
 import dongguk.osori.domain.user.dto.LoginRequestDto;
 import dongguk.osori.domain.user.dto.SignupUserDto;
 import dongguk.osori.domain.user.dto.UserProfileDto;
@@ -9,6 +10,8 @@
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
+import java.util.Map;
+
 @Slf4j
 @RequiredArgsConstructor
 @CrossOrigin(origins = "http://localhost:3000")
@@ -17,18 +20,48 @@
 public class UserController {
 
     private final UserService userService;
+    private final EmailService emailService;
+
+
+    // 이메일 인증 코드 전송
+    @PostMapping("/signup/send-email")
+    public ResponseEntity<String> sendSignupEmail(@RequestBody Map<String,String> request) {
+        String email = request.get("email"); // 이메일 주소 추출
+        if (email == null || email.isEmpty()) {
+            return ResponseEntity.status(400).body("이메일이 올바르지 않습니다.");
+        }
+        emailService.sendEmail(email);
+        return ResponseEntity.ok("인증 코드가 이메일로 전송되었습니다.");
+    }
+
+
+    // 이메일 인증 코드 확인
+    @PostMapping("/signup/verify-code")
+    public ResponseEntity<String> verifyEmailCode(@RequestBody EmailVerificationDto verificationDto) {
+        boolean isVerified = emailService.verifyAuthCode(verificationDto.getEmail(), verificationDto.getCode());
+
+        if (isVerified) {
+            return ResponseEntity.ok("이메일 인증이 완료되었습니다.");
+        } else {
+            return ResponseEntity.status(400).body("잘못된 인증 코드입니다.");
+        }
+    }
+
 
     // 회원가입
     @PostMapping("/signup")
     public ResponseEntity<String> signup(@RequestBody SignupUserDto signupUserDto) {
         try {
+            // 이메일 인증이 완료된 사용자만 회원가입 가능
+            if (!emailService.verifyAuthCode(signupUserDto.getEmail(), signupUserDto.getAuthCode())) {
+                return ResponseEntity.status(400).body("이메일 인증이 완료되지 않았습니다.");
+            }
+
             userService.signup(signupUserDto);
             return ResponseEntity.ok("회원가입이 완료되었습니다.");
         } catch (IllegalArgumentException e) {
-            log.error("Signup failed: {}", e.getMessage());
             return ResponseEntity.status(400).body(e.getMessage());
         } catch (Exception e) {
-            log.error("Unexpected error during signup", e);
             return ResponseEntity.status(500).body("서버 에러 발생. 나중에 다시 시도해주세요.");
         }
     }
diff --git a/src/main/java/dongguk/osori/domain/user/dto/EmailVerificationDto.java b/src/main/java/dongguk/osori/domain/user/dto/EmailVerificationDto.java
new file mode 100644
index 0000000..6972299
--- /dev/null
+++ b/src/main/java/dongguk/osori/domain/user/dto/EmailVerificationDto.java
@@ -0,0 +1,13 @@
+package dongguk.osori.domain.user.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class EmailVerificationDto {
+    private String email;
+    private String code;
+}
diff --git a/src/main/java/dongguk/osori/domain/user/dto/SignupUserDto.java b/src/main/java/dongguk/osori/domain/user/dto/SignupUserDto.java
index 0baa2ff..70d5257 100644
--- a/src/main/java/dongguk/osori/domain/user/dto/SignupUserDto.java
+++ b/src/main/java/dongguk/osori/domain/user/dto/SignupUserDto.java
@@ -11,4 +11,5 @@ public class SignupUserDto {
     private String nickname;
     private String email;
     private String password;
+    private String authCode;
 }
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
index 540f597..8302771 100644
--- a/src/main/resources/application.properties
+++ b/src/main/resources/application.properties
@@ -24,3 +24,17 @@ server.servlet.session.cookie.name=JSESSIONID
 server.servlet.session.cookie.secure=false
 server.servlet.session.cookie.http-only=true
 server.servlet.session.timeout=30m
+
+# Gmail smtp
+spring.mail.host=smtp.gmail.com
+spring.mail.port=587
+spring.mail.username=dgu.osori@gmail.com
+spring.mail.password=giybewxenbvecvqr
+spring.mail.properties.mail.smtp.auth=true
+spring.mail.properties.mail.smtp.starttls.enable=true
+spring.mail.properties.mail.smtp.starttls.required=true
+spring.mail.properties.mail.smtp.ssl.trust=smtp.gmail.com
+spring.mail.properties.mail.smtp.connectiontimeout=5000
+spring.mail.properties.mail.smtp.timeout=5000
+spring.mail.properties.mail.smtp.writetimeout=5000
+