这通常出现在那些擅长用临时或一次性电子邮件地址的电子邮件服务提供商身上。

This is often done with email providers who specialize in temporary or disposable email addresses.

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几乎所有的电子邮件服务提供商(esp)或多渠道通信公司都会为他们的客户维护这些名单。

Almost all email service providers (ESP) or multi-channel messaging companies maintain these lists for their clients.

youdao

他们公司还额外付费给电子邮件服务提供商进行邮件存档，这样就不存在是否保留电子邮件的问题。

The company pays an additional fee to its E-mail provider to archive e-mails. That way, there is no question of whether to keep or delete e-mails.

youdao