Could not connect to SMTP host: smtp.163.com, port: 25;阿里云 ECS
ECS基于安全考虑，目前已禁用25端口。html 若是您的发送程序部署在阿里云ECS上，建议您不勾选SSL时，使用80端口，勾选SSL时，使用465端口。java 测试端口 telnet smtp.163.com 25安全 测试网络 ping smtp.163.com markdown import javax.mail.*;
import javax.mail.internet.Intern
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