You can define an expiration date and time for the message, after which the recipient will no longer be able to open or view it.

你可以给邮件设定一个过期日期和时间，过期之后即使是收件人也无法打开或者阅读邮件。

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The author raises unique opinion in view of anticipatory breach of contract's characteristics, thinking it should happen at or before the expiration.

本人针对预期违约特征提出独特见解，认为预期违约应发生在履行期限届至或届满前。

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Alternatively, investors may be engaging other strategies such as covered call selling, or outright call selling ahead of expiration on the view that the options will expire worthless or nearly worthless on Friday as time erosion accelerates.

FORBES: Options Players Bet On New High For Target, Blue Coat Bulls Strike Out

In general, Coke takes a longer view on options plans--with a 15-year expiration for grants to be exercised with four-year vesting periods.

FORBES: Magazine Article

Naturally, with such an inclusive view, the statistics can be skewed to make it appear that the expiration of the top two tax rates will ravage small business owners.

FORBES: President Obama's Tax Proposal And The Fate Of The Small Business Owner