full-disclosure - Re: a question about e-mails

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

From: killedbythoughts at mindcrime.net (Sebastian Niehaus)
Subject: Re: a question about e-mails

"Dave Howe" <DaveHowe@....sharp-uk.co.uk> writes:

> If you aren't listed in To or CC, it is obvious you were BCCed,
> and it is impossible to determine the other BCC recipients as that
> information never leaves the mail composer (that said, an initial
> first-hop host *could* compare multiple emails sent in a single session,
> and rebuild the BCC 

Given the recipients of all mails are on the same domain or on the
same MX the last hop can rebuild the bcc as well.

Unless somebody inbetween uses qmail as mailserver :-)


Sebastian

--