bigcapital/packages/server-nest/src/modules/Mail/Mail.module.ts

import { Module } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { createTransport } from 'nodemailer';
import { MAIL_TRANSPORTER_PROVIDER } from './Mail.constants';
import { MailTransporter } from './MailTransporter.service';

@Module({
  imports: [
    {
      module: MailModule,
      providers: [
        {
          provide: MAIL_TRANSPORTER_PROVIDER,
          useFactory: (configService: ConfigService) => {
            // Create reusable transporter object using the default SMTP transport
            const transporter = createTransport({
              host: configService.get('mail.host'),
              port: configService.get('mail.port'),
              secure: configService.get('mail.secure'), // true for 465, false for other ports
              auth: {
                user: configService.get('mail.username'),
                pass: configService.get('mail.password'),
              },
            });
            return transporter;
          },
        },
      ],
    },
    MailTransporter
  ],
})
export class MailModule {}