高送达率邮件平台选 SendGrid：免费试用 + 多语言开发集成指南

import os
from dotenv import load_dotenv
from sendgrid import SendGridAPIClient
from sendgrid.helpers.mail import Mail

load_dotenv() # 加载环境变量（包含SendGrid API密钥）
sg = SendGridAPIClient(api_key=os.environ.get('SENDGRID_API_KEY'))
message = Mail(
    from_email='sender@example.com',
    to_emails='recipient@example.com',
    subject='Hello, World!',
    plain_text_content='This is your first email with SendGrid Python SDK!'
)
response = sg.send(message)
print(response.status_code)
print(response.body)
print(response.headers)

<dependency>
    <groupid>com.sendgridgroupid>
    <artifactid>sendgrid-javaartifactid>
    <version>4.9.3version>
dependency>

import com.sendgrid.*;
import com.sendgrid.helpers.mail.mail;
import com.sendgrid.helpers.mail.objects.content;
import com.sendgrid.helpers.mail.objects.email;

public class sendgriddemo {
    public static void main(String[] args) throws Exception {
        //替换成你的sendgrid api key
        String apiKey = "your_api_key";
        //创建发件人和收件人
        Email from = new Email("from@example.com");
        Email to = new Email("to@example.com");
        //设置邮件主题和内容
        String subject = "Hello world from sendgrid!";
        Content content = new Content("text/plain", "This is a test email.");
        Mail msg = new Mail(from, subject, to, content);
        SendGrid sg = new SendGrid(apiKey);
        Request request = new Request();
        try {
            request.setMethod(Method.POST);
            request.setEndpoint("mail/send");
            request.setBody(msg.build());
            Response response = sg.api(request);
            System.out.println(response.getStatusCode());
            System.out.println(response.getBody());
            System.out.println(response.getHeaders());
        } catch (IOException ex) {
            throw ex;
        }
    }
}

using SendGrid;
using SendGrid.Helpers.Mail;
using System;
using System.Threading.Tasks;

namespace Example
{
    internal class Example
    {
        private static void Main()
        {
            Execute().Wait();
        }

        static async Task Execute()
        {
            var apiKey = Environment.GetEnvironmentVariable("NAME_OF_THE_ENVIRONMENT_VARIABLE_FOR_YOUR_SENDGRID_KEY");
            var client = new SendGridClient(apiKey);
            var from = new EmailAddress("test@example.com", "Example User");
            var subject = "Sending with SendGrid is Fun";
            var to = new EmailAddress("test@example.com", "Example User");
            var plainTextContent = "and easy to do anywhere, even with C#";
            var htmlContent = "and easy to do anywhere, even with C#";
            var msg = MailHelper.CreateSingleEmail(from, subject, to, plainTextContent, htmlContent);
            var response = await client.SendEmailAsync(msg);
            Console.WriteLine(response.StatusCode);
            Console.WriteLine(response.Body.ReadAsStringAsync().Result);
            Console.WriteLine(response.Headers);
        }
    }
}