Exchange issue: Remote Server returned '500 5.3.3 Unrecognized command'
Hello, I have been having this issue for some time now and cant seem to narrow it down. We have one vendor we cant email. Everytime I lookup the error it states their server does not have sufficient disk space. I have redacted our server info. I cant seem to figure out where the error is coming from because they keep telling me their server has sufficient space. I also performed a couple of MX tests and their server seems to fail the TLS tests.
remote.TFSJax.com rejected your message to the following email addresses:
'rreyes@tfsjax.com' (rreyes@tfsjax.com)
The recipient's email system can't process this message. Please try resending the message later.
remote.TFSJax.com gave this error:
Unrecognized command
Diagnostic information for administrators:
Generating server: "my mail server"
rreyes@tfsjax.com
remote.TFSJax.com
Remote Server returned '500 5.3.3 Unrecognized command'
Original message headers:
Received: from "my mail server" by
"my mail server" with Microsoft SMTP Server
(TLS) id 15.0.1263.5; Fri, 29 Dec 2017 10:12:40 -0500
Received: from "my mail server" by
"my mail server" with Microsoft SMTP Server
(TLS) id 15.0.1263.5; Fri, 29 Dec 2017 10:12:39 -0500
Received: from "my mail server" ([fe80::b8bb:d61a:d661:452]) by
"my mail server"([fe80::b8bb:d61a:d661:452%12]) with mapi id
15.00.1263.000; Fri, 29 Dec 2017 10:12:39 -0500
From: "me:
To: "'rreyes@tfsjax.com'" <rreyes@tfsjax.com>
Subject: Test
Thread-Topic: Test
Thread-Index: AdOAt3TkYICXtvZZRzORQP6KJ/1sFQ==
Date: Fri, 29 Dec 2017 15:12:39 +0000
Message-ID: <cb403fd5fab544589c51c3e9e587e522@"my email server">
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-ms-exchange-transport-fromentityheader: Hosted
x-originating-ip: [xxx.xxx.xxx.xxx]
Content-Type: multipart/alternative;
boundary="_000_cb403fd5fab544589c51c3e9e587e522S"myemailserver_"
MIME-Version: 1.0
Return-Path: "my email"
DNS RESULTS:
Reply from 96.94.55.86: bytes=32 time=21ms TTL=58
Reply from 96.94.55.86: bytes=32 time=15ms TTL=58
Reply from 96.94.55.86: bytes=32 time=14ms TTL=58
Reply from 96.94.55.86: bytes=32 time=14ms TTL=58
Ping statistics for 96.94.55.86:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 14ms, Maximum = 21ms, Average = 16ms
C:\Users\administrator.CO>nslookup remote.TFSJax.com
Server: "my dns server"
Address: xxx.xxx.xxx.xxx
Well it does certainly sound like a recipient issue but SMTPSend Protocol Logs from your Exchange server would help in proving it. Is verbose logging enabled on the Send Connector associated with this recipient?
Thank you for confirming, I have been thinking the same thing but they don't have any IT support. So when I talk to them they don't understand how to troubleshoot from their end.
Just think of it as job security for those of us who take this seriously :)
Exchange
Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.