Strange entries in qmail-send log

I've found several entries similar to the following in my logs. Does
it mean that it is open relay?

@40000000461b3b913a3f79e4 new msg 817864
@40000000461b3b913a3f81b4 info msg 817864: bytes 2367 from <> qp 18589
uid 206
@40000000461b3b913b967e64 starting delivery 326: msg 817864 to remote
kjdhjene@epal.zzn.com
@40000000461b3b913b9695d4 status: local 0/10 remote 1/20
@40000000461b3ba01962a264 delivery 326: failure:
207.183.238.23_does_not_like_recipient./
Remote_host_said:_551_5.7.1_Recipient_not_found/
Giving_up_on_207.183.238.23./
@40000000461b3ba01962bdbc status: local 0/10 remote 0/20
@40000000461b3ba01a13878c bounce msg 817864 qp 18592
@40000000461b3ba01a139efc end msg 817864

I have nothing to do with epal.zzn.com (it is not in rcpthosts), but
apparently it tries to relay this message,
or at least to contact a foreign mail server.

I suspect this is due to the empty from field <>, as it seems to
reject messages with a 553 error code in all open relay tests that
I've tried.

"Nadav" <thesamet@gmail.com> writes:

> I've found several entries similar to the following in my logs. Does
> it mean that it is open relay?
>
> @40000000461b3b913a3f79e4 new msg 817864
> @40000000461b3b913a3f81b4 info msg 817864: bytes 2367 from <> qp 18589
> uid 206
> @40000000461b3b913b967e64 starting delivery 326: msg 817864 to remote
> kjdhjene@epal.zzn.com
> @40000000461b3b913b9695d4 status: local 0/10 remote 1/20
> @40000000461b3ba01962a264 delivery 326: failure:
> 207.183.238.23_does_not_like_recipient./
> Remote_host_said:_551_5.7.1_Recipient_not_found/
> Giving_up_on_207.183.238.23./
> @40000000461b3ba01962bdbc status: local 0/10 remote 0/20
> @40000000461b3ba01a13878c bounce msg 817864 qp 18592
> @40000000461b3ba01a139efc end msg 817864

Looks like a spam bounce.

--
Dave Sill Oak Ridge National Lab, Workstation Support
Author, The qmail Handbook <http://web.infoave.net/~dsill>
<http://lifewithqmail.org/>: Almost everything you always wanted to know.