Vacation problem

[dimon at intellinetinc.com]

Quoting John Alton Tamplin <jtampli at sph.emory.edu>:

> dimon at intellinetinc.com wrote:
> 
> >I'm wondering why cyrus setting sender to <>, not to <dmitry at synodon.com>,
> or 
> >even <postmaster> as I made configuration in my imapd.conf?
> >May be I missed something?
> >
> You don't want an auto-generated message generating a bounce message, 
> since that could lead to an infinite loop.  Thus, just like 
> mailer-daemon messages in the MTA, a vacation message should have the 
> envelope from set to <>.
> 

So what is you suggestion? How do I fix this problem? Why the mail server 
doesn't accept the message if the envelope from set right?