[rt-users] reply to ticket by emai

[Andrew Kornilov]

Sorry. may be double (first message has wrong From: address)
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Hi all.
User can create ticket by email. When i'm sending them an answer and 
then user answer to my answer  ;)  system doesn't allow to post it:

RT thinks this message may be a bounce 
(/usr/lib/rt/RT/Interface/Email.pm:692)
Permission Denied (/usr/lib/rt/RT/Interface/Email.pm:796)

I've latest rt-3.4.2+svn updates.
User must have login to do such things?