Can't receive emails from clients using symantec

[Paul @ Armsign]

Hi, 

 

For nearly 1/2 year now, we've been unable to receive emails from clients using higher-levels of symantec security. We had an issue last year with an infected machine that appears to have given us a negative reputation (Case 00013827), but we had this lifted late last year and we still don't receive emails.

Here's an example:

Diagnostic information for administrators:

Generating server: LV-EX01.lismore.local

[e-mail]
server-18.tower-403.messagelabs.com
Remote Server returned '550 Invalid recipient <[e-mail]> (#5.1.1)'

Original message headers:

Received: from LV-EX01.lismore.local (10.1.2.18) by LV-EX01.lismore.local

(10.1.2.18) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 27 Nov 2018

12:05:35 +1100

Received: from LV-EX01.lismore.local ([fe80::a1e0:dede:77a3:156d]) by

LV-EX01.lismore.local ([fe80::a1e0:dede:77a3:156d%16]) with mapi id

15.00.1367.000; Tue, 27 Nov 2018 12:05:35 +1100

From: Kate Steel <[e-mail]>

To: "'[e-mail]'" <[e-mail]>

Subject: test

Thread-Topic: test

Thread-Index: AdSF7UupFZy6WiA5Sf66pQIm+USZgA==

Date: Tue, 27 Nov 2018 01:05:35 +0000

Message-ID: <[e-mail]>

Accept-Language: en-AU, en-US

Content-Language: en-US

X-MS-Has-Attach:

X-MS-TNEF-Correlator:

catalogueonsend: False

x-ms-exchange-transport-fromentityheader: Hosted

x-originating-ip: [10.10.2.112]

Content-Type: multipart/alternative;

        boundary="_000_ad5f04ab2f1e4a3097ad423beff6146eLVEX01lismorelocal_"

MIME-Version: 1.0

 

This issue is now happening with other clients who are using symantec products. We are unable to send/receive pretty much with everyone using your products. Can we get this resolved?

 

 

[ℬrίαη]

If you haven't done so already submit a sample of an email that's blocked to:

[e-mail] 

Links for reference:

https://www.symantec.com/docs/TECH82881

https://www.symantec.com/docs/TECH250089

https://www.symantec.com/docs/TECH240145

This is the first place to start until someone from Symantec can review this thread and remediate.

[Rick212]

Just an FYI - The e-mail addres you supplied is not valid.

 

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

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For further assistance, please send mail to <postmaster>.

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<[e-mail]>: 554 5.1.2 Recipient address rejected: User unknown

[Paul @ Armsign]

 

Which email address are you referring to?

 

 

[Paul @ Armsign]

So does anyone check these?

[ℬrίαη]

Not really.

[Paul @ Armsign]

Thanks Brian.