部署好后，发现发送邮件没有一封是成功的

[lvmin520]

1、邮件发送全是失败，请帮忙看看

2、配置全部配置了，请帮忙看看是否存在什么问题。ptr的配置不是必要的吧

[dreambladeflag]

Please check the failure reason. You just click the red number to view reasons.

[vxtls]

If your recipient is Gmail, requests without PTR will be dropped.

[lvmin520]

感谢你们的回复，原因都是这个，昨天查了一下，用了阿里云的服务器，默认封禁TCP25端口，用不了邮件服务。不知是否有其他的解决方式。

[vxtls]

@lvmin520 I believe you should use servers from international cloud service providers such as OVHCloud, BuyVM, Vultr, etc. and by the way, some cloud service's port 25 need you create a support ticket to explain your purpose and if your reason is acceptable they will open your port 25 for you

[lscamg]

@lvmin520 阿里云提工单，叫他们开发25端口给你

[lvmin520]

感谢各位，已经解决了（申请了25端口）

[taixi1268]

你好 ，阿里云你是怎么申请开了25端口的啊，我的不通过啊