Is Postfix doing The Right Thing?

Hello,

some days ago I noticed a deferred message in my postfix queue; I put it
on hold to investigate later. This is what I'm doing now, but there are
some questions I'd like to have answered. The following I consider facts:

- my mailserver received a message for postmaster (which is a valid
address on my system...)
- the message was passed to Cyrus LMTPd
- LMTPd rejected the message because "Message has no header/body separator"
- Postfix generated a notification and tried to send it to the original
sender. The notification couldn't be delivered ("Operation timed out")
and stayed in my queue.

Some questions:

- Why does Postfix generate such a notification? The original sender
address is probably fake / abused, so I don't want to send automated
messages to such addresses.
- Is it possible to configure this behaviour?
- Is this Cyrus IMAPd's fault and I'm completely wrong on this list?

If I should provide more information about my mail system or the deferred
message, please let me know.


Help is appreciated!

TIA, Jukka

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