Google has adapted its free email service to help those letting loose after a few evening cocktails¹ or succumbing² to lovelorn moments from firing off messages they might regret in the morning.

Mail Goggles³ software comes to life after dark and on weekends, when altered states of mind are more probable, and requires that five simple math problems be answered correctly in less than a minute in order to send a Gmail missive.

"Sometimes I send messages I shouldn't send," Gmail engineer Jon Perlow wrote Monday in a website posting announcing the optional new feature.

"Like the time I told that girl I had a crush on her over text message. Or the time I sent that late night email to my ex-girlfriend that we should get back together."

Gmail users can adjust their email settings to activate⁴ the Goggles feature and dictate⁵ the times it is active.

"It will check that you're really sure you want to send that late night Friday email," Perlow wrote.

"And what better way to check than by making you solve a few simple math problems after you click send to verify you're in the right state of mind?"

Google日前在其电邮系统中增加了一项新的功能，这项功能可以防止你在喝醉后或失恋的时候发送一些事后后悔发出的邮件。

（在默认设置下，）Mail Goggles软件会在深夜和周末时激活，因为这个时候人的思想状态不太稳定。在发送邮件前，Mail Goggles会要求发信人在不到一分钟的时间内正确回答五道简单的数学题。

Gmail研发工程师乔恩•佩罗于本周一在网上发贴公布了这一可选的新功能，他在其中写道：“我有时候就会发一些不该发送的邮件。”

“比如，有时我会发短信向我爱慕的女孩表白；或者我在深夜给前女友发邮件，希望我们能重修旧好。”

Gmail用户可以自行修改邮箱设置，启用Goggles功能，并可设定启用时间。

佩罗说：“这项功能可以帮助你确认所发送的邮件是否是一时冲动的想法。”

“而要确认你发邮件时是否清醒，没有什么办法比几个简单的数学题更有效了。”