如何通过 Flutter web 直接发送电子邮件

我正在构建一个 flutter web，我必须通过电子邮件将表单数据发送到我的 Gmail 电子邮件地址，我该怎么办？请帮我。 我有用户“mailer 3.0.4”和 flutter_email_sender：^2.2.2 但他们都没有工作...... 这是我的代码：

  // Perform login or signup
  Future<void> _validateAndSubmitForInformationForm() async {
    print('1');
    final MailOptions mailOptions = MailOptions(
      body: 'a long body for the email <br> with a subset of HTML',
      subject: 'the Email Subject',
      recipients: ['[email protected] /cdn-cgi/l/email-protection'],
      isHTML: true,
      bccRecipients: ['[email protected] /cdn-cgi/l/email-protection'],
      ccRecipients: ['[email protected] /cdn-cgi/l/email-protection'],
//      attachments: [
//        'path/to/image.png',
//      ],
    );
    print('3');

    await FlutterMailer.send(mailOptions);
    print('2');
  }

您可以使用 SendGrid 之类的工具从 flutter mobile 发送电子邮件，其中包含以下内容：对于格式错误表示抱歉。

import 'package:http/http.dart' as http;

class SendGridUtil {
  static sendRegistrationNotification(String email) async {
    Map<String, String> headers = new Map();
    headers["Authorization"] =
        "Bearer $$$SENDGRIDAPIKEY$$$";
    headers["Content-Type"] = "application/json";

    var url = 'https://api.sendgrid.com/v3/mail/send';
    var response = await http.post(url,
        headers: headers,
        body:
            "{\n          \"personalizations\": [\n            {\n              \"to\": [\n                {\n                  \"email\": \"[email protected] /cdn-cgi/l/email-protection\"\n                },\n                {\n                  \"email\": \"[email protected] /cdn-cgi/l/email-protection\"\n                }\n              ]\n            }\n          ],\n          \"from\": {\n            \"email\": \"[email protected] /cdn-cgi/l/email-protection\"\n          },\n          \"subject\": \"New user registration\",\n          \"content\": [\n            {\n              \"type\": \"text\/plain\",\n              \"value\": \"New user register: $email\"\n            }\n          ]\n        }");
    print('Response status: ${response.statusCode}');
    print('Response body: ${response.body}');
  }
}

要从 flutter web 发送电子邮件，您可以使用类似 firebase 云函数的东西 - 这是在 firebase auth 中创建新用户时执行的函数：

import * as functions from 'firebase-functions';
import * as admin from 'firebase-admin';
const sgMail = require('@sendgrid/mail')

admin.initializeApp(functions.config().firebase);

exports.sendWelcomeEmail = functions.auth.user().onCreate(user => {

console.log("User with email created: " + user.email);

sgMail.setApiKey("$$$SENDGRIDKEY$$$");
const liftAiMsg = {
  to: '[email protected] /cdn-cgi/l/email-protection',
  from: '[email protected] /cdn-cgi/l/email-protection',
  subject: 'New user created',
  text: 'New user created with email: ' +user.email,
  html: "<strong>New user created with email:  "+user.email+"</strong>",
};

sgMail.send(liftAiMsg);

const customerMsg = {
  to: user.email,
  from: '[email protected] /cdn-cgi/l/email-protection',
  subject: 'Welcome to LiftAI',
  text: 'Welcome to LiftAI',
  html: '<strong>Welcome to LiftAI!</strong>',
};

sgMail.send(customerMsg);


});