Work issue, specific text in emails to external addresses returning 571 error

bledd

bledd

bledd

Don
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Bit of a strange one.

I'd rather not give the specific domain name in question.

I'll type an example though.



When we send emails externally, some staff have a specific line of text in their email signature.

Anyone with this text is suddenly getting 571 Delivery not authorised, message refused responses.

The text is..
http://www.ourdomain.com

If we send it like this..
http://ourdomain.com then it gets through no problem.

Anyone got any tips on where I can search online to whitelist this text?

To change multiple signatures for hundreds of users would be a real headache. Also replies to only emails wouldn't be working either.

Getting these responses from Gmail and Live.co.uk servers, not tried any others at the moment.
 
Requested #571 Delivery not authorized, message refused ##
From: example.
To: "example
Subject: FW: test17
Thread-Topic: test17
Thread-Index: AdJAylr0lzNHBDXITw2bBt3Jz5qUMAAAFzSw
Date: Thu, 17 Nov 2016 12:04:27 +0000
Message-ID: <example>
Accept-Language: en-GB, en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [IP]
Content-Type: multipart/alternative;
boundary="_example"
MIME-Version: 1.0


Nothing useful :/
 
I've had a customer who was having some but not all outbound e-mails rejected.

They had a link to their own website in the e-mail. Somehow that had been compromised to push out pop-ups. Some anti-spam systems were checking the URL in the footer and rejecting the whole e-mail because of the reputation / content of that URL.
 
assuming the response if from any address you send to and fairly quick its (probably) the SMTP server you are sending from, i'm guessing its not your exchange / mail server its a 3rd party / hosted solution...

speak to them its likely their security - that link is blacklisted for some reason
 
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