I have a server running Exchange 2007. I recently had to change my external IP address and I'm not able to receive email from some domains. The senders from those blocked domains
received the email below... I would appreciate any guidance on how to start troubleshooting/fixing this error...
Thank you,
Lizza
++++++++++++++++++++++++++++++++++++++++++++
Delivery has failed to these recipients or distribution lists:
myaddress@mydomain.com
An error occurred while trying to deliver this message to the recipient's e-mail address. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator.
Diagnostic information for administrators:
Generating server: delivery
myaddress@mydomain.com
#< #5.0.0 smtp; 554 5.4.7 [internal] exceeded max time without delivery> #SMTP#
Original message headers:
X-AuditID: 9f6efc20-b7b9cae00xxxx9-7b-4b435dcdf00d
Received: from lxXXX96.xyz.abc1.sendersdomain.com (Unknown_Domain
[xx.xx.xxx.xxx]) by amsgXXXX.sendersdomain.com (Senders SMTP
Gateway) with SMTP id xx.xx.xxxxx.xxxxxx; Tue, 5 Jan 2026 10:42:05 -0500
(EST)
Received: from localhost (localhost.localdomain [127.0.0.1])
by lx000096.xyz.abc1.sendersdomain.com (postfix) with ESMTP id 710732CB74
for <myaddress@mydomain.com>; Tue, 5 Jan 2026 10:48:01 -0500 (EST)
Received: from WN000017.xyz.abc1.sendersdomain.com (mail07.xyz.abc1.sendersdomain.com [xx.xx.xxx.xxx])
by lx000096.xyz.abc1.sendersdomain.com (postfix) with ESMTP
for <myaddress@mydomain.com>; Tue, 5 Jan 2026 10:47:59 -0500 (EST)
Received: from WN000075.xyz.abc1.sendersdomain.com
([fe80::8ca5:d878:44c8:676e]) by WN000017.xyz.abc1.sendersdomain.com
([fe80::19e6:a2af:b539:126d%11]) with mapi; Tue, 5 Jan 2026 10:47:59 -0500
From: "SendersName" <sendersemail@sendersdomain.com>
To: "'My Name'" <myaddress@mydomain.com>
Date: Tue, 5 Jan 2026 10:47:59 -0500
Subject: test
Thread-Topic: Test
Thread-Index: AcqOxxxxxL/ySEyLfmpZwCP+8Q==
Message-ID: <F73C2A86E0FExxxxxxxxx7B1D8xxxC0BB0216@WN000075.xyz.abc1.sendersdomain.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
acceptlanguage: en-US
Content-Type: multipart/alternative;
boundary="_000_F73C2A8xxxxxxxxxF0DA72507B1D8xxxC0BB0216WN000075xyzab_"
MIME-Version: 1.0
X-Brightmail-Tracker: AAAAAA==