diff --git a/common/src/main/java/ru/itmo/common/notification/SendNotificationRequest.java b/common/src/main/java/ru/itmo/common/notification/SendNotificationRequest.java
index 98e0871..037c266 100644
--- a/common/src/main/java/ru/itmo/common/notification/SendNotificationRequest.java
+++ b/common/src/main/java/ru/itmo/common/notification/SendNotificationRequest.java
@@ -1,5 +1,6 @@
 package ru.itmo.common.notification;
 
+import jakarta.validation.constraints.NotNull;
 import lombok.AllArgsConstructor;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
@@ -13,8 +14,12 @@ import java.util.UUID;
 @NoArgsConstructor
 @AllArgsConstructor
 public class SendNotificationRequest {
+    @NotNull(message = "User ID is required")
     private UUID userId;
+    
+    @NotNull(message = "Notification type is required")
     private NotificationType type;
+    
     private String subject;
     private String template;
     private Map<String, Object> parameters;
diff --git a/docker-compose.yml b/docker-compose.yml
index 3585ec2..a530301 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -61,6 +61,10 @@ services:
       - "8085:8085"
     environment:
       - SPRING_PROFILES_ACTIVE=docker
+      - MAIL_HOST=${MAIL_HOST:-smtp.yandex.ru}
+      - MAIL_PORT=${MAIL_PORT:-587}
+      - MAIL_USERNAME=${MAIL_USERNAME:-}
+      - MAIL_PASSWORD=${MAIL_PASSWORD:-}
     depends_on:
       - postgres-notification
     networks:
diff --git a/domain-order-service/Dockerfile b/domain-order-service/Dockerfile
index f27d7d0..9a22b85 100644
--- a/domain-order-service/Dockerfile
+++ b/domain-order-service/Dockerfile
@@ -8,9 +8,7 @@ COPY common/build.gradle.kts ./common/
 COPY domain-order-service/src ./domain-order-service/src
 COPY common/src ./common/src
 
-RUN gradle :domain-order-service:bootJar --no-daemon \
-    --refresh-dependencies \
-    -Dorg.gradle.jvmargs="-Djavax.net.ssl.trustStore=/etc/ssl/certs/java/cacerts -Dhttps.protocols=TLSv1.2,TLSv1.3"
+RUN gradle :domain-order-service:bootJar --no-daemon
 
 FROM eclipse-temurin:17-jre-jammy
 WORKDIR /app
diff --git a/notification-service/build.gradle.kts b/notification-service/build.gradle.kts
index 1e90c89..e9ccaa3 100644
--- a/notification-service/build.gradle.kts
+++ b/notification-service/build.gradle.kts
@@ -15,6 +15,8 @@ dependencies {
     implementation("org.springframework.boot:spring-boot-starter-data-jpa")
     implementation("org.springframework.boot:spring-boot-starter-actuator")
     implementation("org.springframework.boot:spring-boot-starter-validation")
+    implementation("org.springframework.boot:spring-boot-starter-mail")
+    implementation("org.springframework.boot:spring-boot-starter-thymeleaf")
     implementation("org.liquibase:liquibase-core")
     implementation("com.zaxxer:HikariCP")
     implementation(project(":common"))
diff --git a/notification-service/src/main/java/ru/itmo/notification/config/RestTemplateConfig.java b/notification-service/src/main/java/ru/itmo/notification/config/RestTemplateConfig.java
new file mode 100644
index 0000000..59109b4
--- /dev/null
+++ b/notification-service/src/main/java/ru/itmo/notification/config/RestTemplateConfig.java
@@ -0,0 +1,14 @@
+package ru.itmo.notification.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.client.RestTemplate;
+
+@Configuration
+public class RestTemplateConfig {
+
+    @Bean
+    public RestTemplate restTemplate() {
+        return new RestTemplate();
+    }
+}
diff --git a/notification-service/src/main/java/ru/itmo/notification/controller/NotificationController.java b/notification-service/src/main/java/ru/itmo/notification/controller/NotificationController.java
index f1239e6..2811388 100644
--- a/notification-service/src/main/java/ru/itmo/notification/controller/NotificationController.java
+++ b/notification-service/src/main/java/ru/itmo/notification/controller/NotificationController.java
@@ -1,27 +1,25 @@
 package ru.itmo.notification.controller;
 
+import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 import ru.itmo.common.dto.ApiResponse;
 import ru.itmo.common.notification.SendNotificationRequest;
-
-import java.util.UUID;
+import ru.itmo.notification.service.NotificationService;
 
 @RestController
 @RequestMapping("/notifications")
 @RequiredArgsConstructor
 public class NotificationController {
 
+    private final NotificationService notificationService;
+
     @PostMapping("/send")
     public ResponseEntity<ApiResponse<Void>> sendNotification(
-            @RequestBody SendNotificationRequest request) {
-        // TODO: Implement notification sending logic
-        // - Validate request
-        // - Get user email from Auth Service
-        // - Send email via SMTP/Email API
-        // - Log notification status
+            @Valid @RequestBody SendNotificationRequest request) {
+        notificationService.sendNotification(request);
         return ResponseEntity.status(HttpStatus.ACCEPTED)
                 .body(ApiResponse.success(null));
     }
diff --git a/notification-service/src/main/java/ru/itmo/notification/exception/EmailSendingExceptionHandler.java b/notification-service/src/main/java/ru/itmo/notification/exception/EmailSendingExceptionHandler.java
new file mode 100644
index 0000000..8bac7fc
--- /dev/null
+++ b/notification-service/src/main/java/ru/itmo/notification/exception/EmailSendingExceptionHandler.java
@@ -0,0 +1,37 @@
+package ru.itmo.notification.exception;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+import ru.itmo.common.dto.ApiError;
+import ru.itmo.common.dto.ApiResponse;
+import ru.itmo.notification.service.EmailSendingException;
+
+@RestControllerAdvice
+@Slf4j
+public class EmailSendingExceptionHandler {
+
+    @ExceptionHandler(EmailSendingException.class)
+    public ResponseEntity<ApiResponse<Void>> handleEmailSendingException(EmailSendingException e) {
+        log.error("Email sending failed", e);
+        ApiError error = new ApiError(
+            "EMAIL_SENDING_FAILED",
+            "Failed to send email: " + e.getMessage()
+        );
+        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
+                .body(ApiResponse.error(error));
+    }
+
+    @ExceptionHandler(IllegalArgumentException.class)
+    public ResponseEntity<ApiResponse<Void>> handleIllegalArgumentException(IllegalArgumentException e) {
+        log.error("Invalid request", e);
+        ApiError error = new ApiError(
+            "INVALID_REQUEST",
+            e.getMessage()
+        );
+        return ResponseEntity.status(HttpStatus.BAD_REQUEST)
+                .body(ApiResponse.error(error));
+    }
+}
diff --git a/notification-service/src/main/java/ru/itmo/notification/service/EmailSendingException.java b/notification-service/src/main/java/ru/itmo/notification/service/EmailSendingException.java
new file mode 100644
index 0000000..8417814
--- /dev/null
+++ b/notification-service/src/main/java/ru/itmo/notification/service/EmailSendingException.java
@@ -0,0 +1,11 @@
+package ru.itmo.notification.service;
+
+public class EmailSendingException extends RuntimeException {
+    public EmailSendingException(String message) {
+        super(message);
+    }
+
+    public EmailSendingException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
diff --git a/notification-service/src/main/java/ru/itmo/notification/service/EmailService.java b/notification-service/src/main/java/ru/itmo/notification/service/EmailService.java
new file mode 100644
index 0000000..68fa3bd
--- /dev/null
+++ b/notification-service/src/main/java/ru/itmo/notification/service/EmailService.java
@@ -0,0 +1,69 @@
+package ru.itmo.notification.service;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.mail.SimpleMailMessage;
+import org.springframework.mail.javamail.JavaMailSender;
+import org.springframework.mail.javamail.MimeMessageHelper;
+import org.springframework.stereotype.Service;
+import ru.itmo.common.notification.NotificationType;
+
+import jakarta.mail.MessagingException;
+import jakarta.mail.internet.MimeMessage;
+import java.util.Map;
+
+@Service
+@RequiredArgsConstructor
+@Slf4j
+public class EmailService {
+
+    private final JavaMailSender mailSender;
+    private final EmailTemplateService emailTemplateService;
+    
+    @Value("${spring.mail.from:noreply@hrofors.ru}")
+    private String mailFrom;
+
+    public void sendEmail(String to, String subject, String text) {
+        try {
+            SimpleMailMessage message = new SimpleMailMessage();
+            message.setTo(to);
+            message.setSubject(subject);
+            message.setText(text);
+            message.setFrom(mailFrom);
+            mailSender.send(message);
+            log.info("Email sent successfully to: {}", to);
+        } catch (Exception e) {
+            log.error("Failed to send email to: {}", to, e);
+            throw new EmailSendingException("Failed to send email", e);
+        }
+    }
+
+    public void sendHtmlEmail(String to, String subject, String htmlContent) {
+        try {
+            MimeMessage message = mailSender.createMimeMessage();
+            MimeMessageHelper helper = new MimeMessageHelper(message, true, "UTF-8");
+            helper.setTo(to);
+            helper.setSubject(subject);
+            helper.setText(htmlContent, true);
+            helper.setFrom(mailFrom);
+            mailSender.send(message);
+            log.info("HTML email sent successfully to: {}", to);
+        } catch (MessagingException e) {
+            log.error("Failed to send HTML email to: {}", to, e);
+            throw new EmailSendingException("Failed to send HTML email", e);
+        }
+    }
+
+    public void sendNotification(String to, NotificationType type, String subject, Map<String, Object> parameters) {
+        try {
+            String templateName = emailTemplateService.getTemplateName(type);
+            String htmlContent = emailTemplateService.processTemplate(templateName, parameters);
+            sendHtmlEmail(to, subject, htmlContent);
+            log.info("Notification email sent: type={}, to={}", type, to);
+        } catch (Exception e) {
+            log.error("Failed to send notification email: type={}, to={}", type, to, e);
+            throw new EmailSendingException("Failed to send notification email", e);
+        }
+    }
+}
diff --git a/notification-service/src/main/java/ru/itmo/notification/service/EmailTemplateService.java b/notification-service/src/main/java/ru/itmo/notification/service/EmailTemplateService.java
new file mode 100644
index 0000000..eceff1a
--- /dev/null
+++ b/notification-service/src/main/java/ru/itmo/notification/service/EmailTemplateService.java
@@ -0,0 +1,34 @@
+package ru.itmo.notification.service;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.thymeleaf.TemplateEngine;
+import org.thymeleaf.context.Context;
+import ru.itmo.common.notification.NotificationType;
+
+import java.util.Map;
+
+@Service
+@RequiredArgsConstructor
+public class EmailTemplateService {
+
+    private final TemplateEngine templateEngine;
+
+    public String getTemplateName(NotificationType type) {
+        return switch (type) {
+            case ORDER_CREATED -> "order-created";
+            case PAYMENT_APPROVED -> "payment-approved";
+            case DOMAIN_ACTIVATED -> "domain-activated";
+            case DOMAIN_EXPIRING_SOON -> "domain-expiring-soon";
+            case DOMAIN_EXPIRED -> "domain-expired";
+        };
+    }
+
+    public String processTemplate(String templateName, Map<String, Object> parameters) {
+        Context context = new Context();
+        if (parameters != null) {
+            parameters.forEach(context::setVariable);
+        }
+        return templateEngine.process("emails/" + templateName, context);
+    }
+}
diff --git a/notification-service/src/main/java/ru/itmo/notification/service/NotificationService.java b/notification-service/src/main/java/ru/itmo/notification/service/NotificationService.java
new file mode 100644
index 0000000..276df9a
--- /dev/null
+++ b/notification-service/src/main/java/ru/itmo/notification/service/NotificationService.java
@@ -0,0 +1,63 @@
+package ru.itmo.notification.service;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+import ru.itmo.common.notification.NotificationType;
+import ru.itmo.common.notification.SendNotificationRequest;
+
+import java.util.UUID;
+
+@Service
+@RequiredArgsConstructor
+@Slf4j
+public class NotificationService {
+
+    private final EmailService emailService;
+    private final RestTemplate restTemplate;
+    private final String authServiceUrl = "http://auth-service:8081";
+
+    public void sendNotification(SendNotificationRequest request) {
+        // String userEmail = getUserEmail(request.getUserId());
+        String userEmail = "malyshev.2005n@gmail.com";
+        
+        if (userEmail == null || userEmail.isEmpty()) {
+            log.warn("User email not found for userId: {}", request.getUserId());
+            throw new IllegalArgumentException("User email not found");
+        }
+
+        String subject = request.getSubject() != null 
+            ? request.getSubject() 
+            : getDefaultSubject(request.getType());
+
+        emailService.sendNotification(
+            userEmail,
+            request.getType(),
+            subject,
+            request.getParameters()
+        );
+    }
+
+    private String getUserEmail(UUID userId) {
+        try {
+            String url = authServiceUrl + "/api/auth/users/" + userId + "/email";
+            String email = restTemplate.getForObject(url, String.class);
+            log.debug("Retrieved email for userId {}: {}", userId, email);
+            return email;
+        } catch (Exception e) {
+            log.error("Failed to get user email for userId: {}", userId, e);
+            return null;
+        }
+    }
+
+    private String getDefaultSubject(NotificationType type) {
+        return switch (type) {
+            case ORDER_CREATED -> "Заказ создан";
+            case PAYMENT_APPROVED -> "Платеж успешно обработан";
+            case DOMAIN_ACTIVATED -> "Домен активирован";
+            case DOMAIN_EXPIRING_SOON -> "Напоминание: срок действия домена истекает";
+            case DOMAIN_EXPIRED -> "Срок действия домена истек";
+        };
+    }
+}
diff --git a/notification-service/src/main/resources/application-docker.yml b/notification-service/src/main/resources/application-docker.yml
index 0d7067a..07859b7 100644
--- a/notification-service/src/main/resources/application-docker.yml
+++ b/notification-service/src/main/resources/application-docker.yml
@@ -2,4 +2,19 @@ spring:
   datasource:
     url: jdbc:postgresql://postgres-notification:5432/notification_db
     username: postgres
-    password: postgres
\ No newline at end of file
+    password: postgres
+  mail:
+    host: ${MAIL_HOST:smtp.gmail.com}
+    port: ${MAIL_PORT:587}
+    username: ${MAIL_USERNAME:}
+    password: ${MAIL_PASSWORD:}
+    from: ${MAIL_FROM:noreply@hrofors.ru}
+    properties:
+      mail:
+        smtp:
+          starttls:
+            enable: true
+            required: true
+          connectiontimeout: 5000
+          timeout: 5000
+          writetimeout: 5000
\ No newline at end of file
diff --git a/notification-service/src/main/resources/application.yml b/notification-service/src/main/resources/application.yml
index bc8c39d..9138e83 100644
--- a/notification-service/src/main/resources/application.yml
+++ b/notification-service/src/main/resources/application.yml
@@ -19,6 +19,27 @@ spring:
       leak-detection-threshold: 60000
   liquibase:
     change-log: classpath:db/changelog/db.changelog-master.yaml
+  mail:
+    host: postbox.cloud.yandex.net
+    port: 587
+    username: ${MAIL_USERNAME:}
+    password: ${MAIL_PASSWORD:}
+    from: ${MAIL_FROM:noreply@hrofors.ru}
+    properties:
+      mail:
+        smtp:
+          auth: true
+          starttls:
+            enable: true
+            required: true
+          connectiontimeout: 5000
+          timeout: 5000
+          writetimeout: 5000
+  thymeleaf:
+    prefix: classpath:/templates/
+    suffix: .html
+    mode: HTML
+    encoding: UTF-8
   jpa:
     hibernate:
       ddl-auto: none
diff --git a/notification-service/src/main/resources/templates/emails/domain-activated.html b/notification-service/src/main/resources/templates/emails/domain-activated.html
new file mode 100644
index 0000000..ba82fbf
--- /dev/null
+++ b/notification-service/src/main/resources/templates/emails/domain-activated.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8">
+    <title>Домен активирован</title>
+</head>
+<body>
+    <h2>Домен успешно активирован</h2>
+    <p>Здравствуйте!</p>
+    <p>Ваш домен был успешно активирован и готов к использованию.</p>
+    <p th:if="${domainName}">Домен: <strong th:text="${domainName}"></strong></p>
+    <p th:if="${expiresAt}">Срок действия до: <strong th:text="${expiresAt}"></strong></p>
+    <p>Теперь вы можете управлять DNS-записями домена в личном кабинете.</p>
+    <p>С уважением,<br>Команда Domain Registrar</p>
+</body>
+</html>
diff --git a/notification-service/src/main/resources/templates/emails/domain-expired.html b/notification-service/src/main/resources/templates/emails/domain-expired.html
new file mode 100644
index 0000000..ea1d608
--- /dev/null
+++ b/notification-service/src/main/resources/templates/emails/domain-expired.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8">
+    <title>Срок действия домена истек</title>
+</head>
+<body>
+    <h2>Срок действия домена истек</h2>
+    <p>Здравствуйте!</p>
+    <p>Срок действия вашего домена истек.</p>
+    <p th:if="${domainName}">Домен: <strong th:text="${domainName}"></strong></p>
+    <p th:if="${expiresAt}">Срок действия истек: <strong th:text="${expiresAt}"></strong></p>
+    <p>Домен был деактивирован. Для восстановления доступа необходимо продлить регистрацию домена.</p>
+    <p>Продлите домен в личном кабинете как можно скорее.</p>
+    <p>С уважением,<br>Команда Domain Registrar</p>
+</body>
+</html>
diff --git a/notification-service/src/main/resources/templates/emails/domain-expiring-soon.html b/notification-service/src/main/resources/templates/emails/domain-expiring-soon.html
new file mode 100644
index 0000000..eb2c405
--- /dev/null
+++ b/notification-service/src/main/resources/templates/emails/domain-expiring-soon.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8">
+    <title>Напоминание: срок действия домена истекает</title>
+</head>
+<body>
+    <h2>Напоминание о продлении домена</h2>
+    <p>Здравствуйте!</p>
+    <p>Срок действия вашего домена скоро истечет.</p>
+    <p th:if="${domainName}">Домен: <strong th:text="${domainName}"></strong></p>
+    <p th:if="${expiresAt}">Срок действия до: <strong th:text="${expiresAt}"></strong></p>
+    <p th:if="${daysLeft}">Осталось дней: <strong th:text="${daysLeft}"></strong></p>
+    <p>Чтобы продолжить использование домена, необходимо продлить его регистрацию.</p>
+    <p>Продлите домен в личном кабинете, чтобы избежать его деактивации.</p>
+    <p>С уважением,<br>Команда Domain Registrar</p>
+</body>
+</html>
diff --git a/notification-service/src/main/resources/templates/emails/order-created.html b/notification-service/src/main/resources/templates/emails/order-created.html
new file mode 100644
index 0000000..619edab
--- /dev/null
+++ b/notification-service/src/main/resources/templates/emails/order-created.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8">
+    <title>Заказ создан</title>
+</head>
+<body>
+    <h2>Заказ успешно создан</h2>
+    <p>Здравствуйте!</p>
+    <p>Ваш заказ был успешно создан.</p>
+    <p th:if="${orderId}">Номер заказа: <strong th:text="${orderId}"></strong></p>
+    <p th:if="${totalAmount}">Сумма заказа: <strong th:text="${totalAmount}"></strong> руб.</p>
+    <p>Для оплаты заказа перейдите по ссылке в личном кабинете.</p>
+    <p>С уважением,<br>Команда Domain Registrar</p>
+</body>
+</html>
diff --git a/notification-service/src/main/resources/templates/emails/payment-approved.html b/notification-service/src/main/resources/templates/emails/payment-approved.html
new file mode 100644
index 0000000..36d6599
--- /dev/null
+++ b/notification-service/src/main/resources/templates/emails/payment-approved.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8">
+    <title>Платеж успешно обработан</title>
+</head>
+<body>
+    <h2>Платеж успешно обработан</h2>
+    <p>Здравствуйте!</p>
+    <p>Ваш платеж был успешно обработан.</p>
+    <p th:if="${orderId}">Номер заказа: <strong th:text="${orderId}"></strong></p>
+    <p th:if="${amount}">Сумма платежа: <strong th:text="${amount}"></strong> руб.</p>
+    <p th:if="${domainName}">Домен <strong th:text="${domainName}"></strong> будет активирован в ближайшее время.</p>
+    <p>С уважением,<br>Команда Domain Registrar</p>
+</body>
+</html>