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List:       mailman-users
Subject:    Re: [Mailman-Users] Hide email address of specific sender
From:       "Stephen J. Turnbull" <stephen () xemacs ! org>
Date:       2015-06-09 4:55:37
Message-ID: 871thlxyye.fsf () uwakimon ! sk ! tsukuba ! ac ! jp
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Mark Sapiro writes:

 > To: the_list@...
 > Sender: her_real_address@...
 > From: the_list_or_some_bogus_address@...

*Don't* recommend using a bogus address -- that requires skill on the
part of the user.  The list address is "known good", use that.

Problem example: if she's not at yahoo.com and uses a fake yahoo.com
address, DMARC will cause bounces from random users whose providers
respect p=reject.  Of course you can mitigate this, but it's just
*one* example, there are plenty of other ways this could go wrong, and
explaining the constraints to the user just isn't worth the effort.

Larry's answer (get a throwaway address) is the one that protects her
privacy best, though.  A sufficiently persistent attacker can probably
trace her through the authenticating IP, but that would be a lot of
effort.  Use of an alias (eg, AOL screen name) or the Sender header
probably exposes her "real" mailbox far too much for her comfort.
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