first commit

src/mail/mail.module.ts

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+import { Global, Module } from '@nestjs/common';
+import { MailService } from './mail.service';
+
+@Global()
+@Module({
+  providers: [MailService],
+  exports: [MailService],
+})
+export class MailModule {}

src/mail/mail.service.ts

@@ -0,0 +1,44 @@
+import { Injectable } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import * as nodemailer from 'nodemailer';
+import { PinoLogger } from 'nestjs-pino';
+
+@Injectable()
+export class MailService {
+  private transporter: nodemailer.Transporter;
+
+  constructor(
+    private readonly configService: ConfigService,
+    private readonly logger: PinoLogger,
+  ) {
+    this.logger.setContext(MailService.name);
+    this.transporter = nodemailer.createTransport({
+      host: this.configService.get<string>('SMTP_HOST'),
+      port: this.configService.get<number>('SMTP_PORT'),
+      secure: false,
+      auth: this.configService.get<string>('SMTP_USER')
+        ? {
+            user: this.configService.get<string>('SMTP_USER'),
+            pass: this.configService.get<string>('SMTP_PASSWORD'),
+          }
+        : undefined,
+      tls: { rejectUnauthorized: false },
+    });
+  }
+
+  async sendCode(to: string, code: string, purpose: string): Promise<void> {
+    const from = this.configService.get<string>('SMTP_FROM')!;
+    try {
+      await this.transporter.sendMail({
+        from,
+        to,
+        subject: `SSO: код ${purpose === 'AUTH' ? 'для входа' : 'подтверждения'}`,
+        text: `Ваш код: ${code}\nДействителен 5 минут.`,
+        html: `<p>Ваш код: <strong>${code}</strong></p><p>Действителен 5 минут.</p>`,
+      });
+      this.logger.info({ to, purpose }, 'Verification code sent via email');
+    } catch (err: unknown) {
+      this.logger.error({ err: err as Error, to }, 'Failed to send email');
+    }
+  }
+}