Yusuf Goolamabbas <[EMAIL PROTECTED]> writes:
> Hi, I have a qmail-1.03 machine saw in my queue a few bounces in
> them. Also, looking at my logs I saw the following message
> @400000003905243f24daf1b4 delivery 34: deferral:
>
>Connected_to_204.68.180.50_but_sender_was_rejected./Remote_host_said:_451_<#@[]>..._unresolvable_host_name_[],_see_RFC_1123,_sections_5.2.2_and_5.2.18./
A bounce message bounced. When this happens, qmail generates a
double-bounce and tries to send it to the local postmaster address. It
uses the completely invalid envelope sender "#@[]" to ensure that
double-bounces can't then bounce again and generate mail loops.
You apparently are forwarding postmaster mail to another system which is
doing resolveable name checks on envelope senders, and doesn't like
qmail's special double-bounce sender.
--
Russ Allbery ([EMAIL PROTECTED]) <http://www.eyrie.org/~eagle/>
