Ok, I got it. I had a misconfiguration of the local domains in the core modul. Now everything works fine. Thank you!

Hi again,

still fighting with this problem. On a local machine running xampp with mercury 4.01b, I can send emails directly over File -> Send mail message. It's being relayed to the smtp and send correctly.

If I however try to send an email through php script (same recipient), I get the following error message:

Received: from spooler by mydomain (Mercury/32 v4.01b); 2 Jun 2008 14:19:40 +0200
X-Envelope-To: pb@localhost
From: Mail Delivery System <postmaster@mydomain>
To: pb@localhost
Date: Mon, 2 Jun 2008 14:19:31 +0200
Subject: Delivery failure notification
MIME-Version: 1.0
Content-Type: Multipart/Report; boundary=Part_Boundary-9BBD2

--Part_Boundary-9BBD2
Content-type: Text/plain; charset=US-ASCII
Content-description: Mail delivery failure report
Content-disposition: Inline

With reference to your message with the subject:
   "*Autoversand*: Benachrichtigung über Sandbox"

The local mail transport system has reported the following problems
it encountered while trying to deliver your message:

-------------------------------------------------------------------

--- Problems not related to specific addresses in the message:
550 Message rejected - address not allowed
*** recipient@extern.de
-------------------------------------------------------------------

Your mail message is being returned to you in the next part of this
message.

Should you need assistance, please mail postmaster@mydomain.

--Part_Boundary-9BBD2
Content-type: Message/RFC822
Content-description: Contents of original mail message

Received: from spooler by mydomain (Mercury/32 v4.01b); 2 Jun 2008 14:19:18 +0200
Received: from MYDOMAIN (127.0.0.1) by mydomain (Mercury/32 v4.01b) ID MG000001;
   2 Jun 2008 14:19:10 +0200
Date: Mon, 02 Jun 2008 14:19:10 +0200
Subject: *Autoversand*: Benachrichtigung über Sandbox
To: a.rueckauer@zeiss.de
From: pb@localhost
X-Mailer: PHP/5.2.3
Message-ID: <988AC7B96@mydomain>

Test der Emailfunktion Sandbox


--Part_Boundary-9BBD2--

 Email-addresses and domain names changed.

 What am I doing wrong?

--- Problems not related to specific addresses in the message:
550 Message rejected - address not allowed
*** recipient@extern.de
-------------------------------------------------------------------

This message is coming from the receiving server  and is a fatal error.  This system may not like the sending address in the message as well.  Turn on session logging in MercuryE (or MercuryC) to see exactly what you are sending to the server.  Use a real email address for sending instead of pb@localhost to get past the anti-spam system.  I believe that my spam system would receive but move to to spam folder anything from the domain @localhost.

Hi,

thanks for your reply. I will try to configure it using a real address.

However, I don't understand why the receiving server is accepting an email that is being send via mercury (gui) and the one over php not, both to the same recipient. The only difference is the sender's address. I will try to use a real address, hopefully that will solve it.

Thank you, will report back how far I got.