SourceForge 把一封通知邮件显式地群发给了 400 多个邮件地址

这封标题为 Removal of FRS area for User Profiles at SourceForge.net 的邮件发自 sfnet_ops@slashdotmedia.com ，并在 “收件人” 中填写了 496 个邮件地址。
邮件全文如下：

Hello,
You have been identified as having saved files in you user FRS profile area (/home/pfs/<username>. We are planning on removing this area for user accounts on March 17th 2015. We wanted to give you the opportunity to move your data to a new location before we remove the data. Here is a link that should help you with moving your data:
https://sourceforge.net/p/forge/documentation/SFTP/
If you need any help please contact us.
Thanks
SourceForge.net Support
sfnet_ops@slashdotmedia.com
https://sourceforge.net/support

这导致每个收到邮件的人都看到了全部 496 个邮件地址。

有人回复：

The ultimate game of prisoners's dilemma! I promise not to sell each of your 495 emails to spammers if you each promise to not do the same!

Cheers,

Afforess

当然，回复的邮件也群发给了另外 495 个邮件地址。