Can anyone on Lotus send emails to Yahoo?

[seec09]

Starting a new thread from http://forums.x10hosting.com/free-ho...geocities.html as I suspect it may be general problem?

Can anyone on LOTUS send email (e.g. via Horde web mail) to a yahoo email address successfully?

To X10 Admin/account manager:
- I have re-tried a few times and still couldn't get emails sent through to yahoo
- I tried 2 different email accounts, including a new one, where
------email from a non x10 email/SMTP server did go through!
------email from x10 (Lotus server) not going through

- latest email header below (from the email that did go through to the non yahoo email, with actual email address disguised as XXXX to prevent spams):
Return-path: <XXXX@seec09.x10hosting.com>
Envelope-to: XXXXX@lamsmail.net
Delivery-date: Tue, 27 May 2008 23:03:45 +0000
Received: from mailfoundry.easy-internet.biz ([206.212.240.122])
by bacchus.diyhost.co.uk with esmtp (Exim 4.6
(envelope-from <XXXX@seec09.x10hosting.com>)
id 1K18Ck-00070P-Cu
for XXXXX@lamsmail.net; Tue, 27 May 2008 23:03:42 +0000
X-Envelope-From: XXXX@seec09.x10hosting.com
X-Envelope-To: XXXXX@lamsmail.net
Received: From x10hosting.com (67.228.161.42) by mailfoundry.easy-internet.biz (MAILFOUNDRY) id IksCdixBEd2BPQAw for XXXXX@lamsmail.net; Tue, 27 May 2008 23:03:35 -0000 (GMT)
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=default; d=seec09.x10hosting.com;
h=Received:Received:Message-ID:Date:From:To:Cc:Subject:MIME-Version:Content-Type:Content-Disposition:Content-Transfer-Encoding:User-Agent:X-AntiAbuse:X-AntiAbuse:X-AntiAbuse:X-AntiAbuse:X-AntiAbuse:X-Source:X-Source-Args:X-Source-Dir;
b=ZL7cG3RXbjJuLKI462FP6k8ZmFjkS6g3hVg67/FEh3EDoFI88ocx+YFJmX+lqR3UUWjRyN70wko2+GhO81GACI71 +PHv2GSu9FLlEhuLbSByB5Idn2Bwi0HMX8Q7uWRx;
Received: from localhost ([127.0.0.1])
by lotus.x10hosting.com with esmtpa (Exim 4.6
(envelope-from <XXXX@seec09.x10hosting.com>)
id 1K18Cb-0008Tz-Eq; Tue, 27 May 2008 18:03:33 -0500
Received: from 87.115.5.46 ([87.115.5.46]) by seec09.x10hosting.com (Horde
MIME library) with HTTP; Tue, 27 May 2008 18:03:33 -0500
Message-ID: <20080527180333.cldweigkogo4s8gk@seec09.x10hosting. com>
Date: Tue, 27 May 2008 18:03:33 -0500
From: XXXX@seec09.x10hosting.com
To: XXXX@yahoo.com
Cc: XXXXX@lamsmail.net
Subject: another email test
MIME-Version: 1.0
Content-Type: text/plain;
charset=ISO-8859-1;
DelSp="Yes";
format="flowed"
Content-Disposition: inline
Content-Transfer-Encoding: 7bit
User-Agent: Internet Messaging Program (IMP) H3 (4.1.6)
X-AntiAbuse: This header was added to track abuse, please include it with any abuse report
X-AntiAbuse: Primary Hostname - lotus.x10hosting.com
X-AntiAbuse: Original Domain - lamsmail.net
X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12]
X-AntiAbuse: Sender Address Domain - seec09.x10hosting.com
X-Source:
X-Source-Args:
X-Source-Dir:

- Did not see emails being bounced back

- Can the SMTP mail logs be investigated to see why emails to yahoo is not going through and work with Yahoo to get Lotus.x10hosting.com de black-listed? Refer to http://help.yahoo.com/l/us/yahoo/mail/postmaster/ for SMTP settings Yahoo are after.
Edit:
Instead of testing with Horde, I also tried updating a PHP script to try to use an external SMTP server (which requires authentication and tested as working and can send mail to Yahoo), and I get some sort of connection error...., can script not connect to external SMTP?

Can the SMTP config be sorted out so mails to Yahoo will go through, please??