On Thu, 30 Jul 2015 01:56:08 +0200
Reindl Harald <h.rei...@thelounge.net> wrote:

> * no mailserver on this world treats the local part case-sensitive

Well.... possibly, but that doesn't apply to all mail-handling software.

Mail::SRS originally treated the local part case-sensitively, but it
had to weaken the protection it offered because most other software
was cavalier about case preservation.

http://search.cpan.org/~shevek/Mail-SRS-0.31/lib/Mail/SRS.pm#Case_Sensitivity

Regards,

Dianne.

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