我们已收到了您的邮件，然而我们还需要一些其它信息以便为您的旅行计划提供帮助。
We received your email however, we require additional information in order to assist you with travel plans.
您的邮件我已收到，非常感谢您在繁忙中为我的问题做出解答。
Your email has been received. It is appreciated for answering my question in your busy time.
虽然这听起来可能多余，因为受援国已收到您的电子邮件，审议通过伴随效应。
Although this may sound redundant as the recipient is already receiving your email, consider the pass-along effect.
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