退订的英文：
Email Unsubscribe

I have been trying to unsubscribe for months, but to no avail.
我已经退订几个月了，但是一直没生效。

You can contact us by email.
你可以通过电子邮件和我们联系。

The forwarding e-mail address is not a valid e-mail address.
转发的电子邮件地址不是有效的电子邮件地址。

The email address in the signing certificate does not match the email address in the message headers.
在已签名的证书中的电子邮件地址与消息标题中的电子邮件地址不匹配。

First you need to get an email address.
首先你需要申请一个电子邮件地址。

I write you an e-mail.
我给你写电子邮件了。

Are you sure you want to unsubscribe?
您确实想要撤消订阅吗?

I have been trying to unsubscribe for months, but to no avail.
我已经退订几个月了，但是一直没生效。