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Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.
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For bcc recipients, you will see one of the the recipients in the header listed as "undisclosed-recipient"
So, the key is to look at the full header...
I hope this helps!
Dan
IT4SOHO