Deorali
asked on
Remote Server returned '550 5.7.1 Recipient not authorized, your IP has been found on a block list'
Hi Exchange Expert,
Two customer of ours are getting mail rejected from us because they are on a block list. In the past, I would add them in the Hub Transport Anti-Spam IP Allow List Providers and everything would be fine. This time it didn't resolve the issue. Is it possible that this issue isn't being caused by our Exchange server or dns/MX record misconfiguration on their part.
I observed that one of them is using the Exchange Online Protection since they have example.protection.outlook.com when queried using mxtoolbox.com and other is hosted Exchange (prod.exchange-labs.com)
Here is NDR message that external users receiving:
mail.abc.com (domain removed) rejected your message to the following email addresses:
John Excel (jexel@abc.com)
mail.abc.com gave this error:
Recipient not authorized, your IP has been found on a block list
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept email from certain senders, or another restriction may be preventing delivery.
Diagnostic information for administrators:
Generating server: BY2PR01MB361.prod.exchange
jexcel@abc.com
mail.abc.com
Remote Server returned '550 5.7.1 Recipient not authorized, your IP has been found on a block list'
Original message headers:
Received: from BY2PR01MB171.prod.exchange
BY2PR01MB361.prod.exchange
Server (TLS) id 15.0.883.10; Tue, 25 Feb 2014 19:36:44 +0000
Received: from BY2PR01MB171.prod.exchange
BY2PR01MB171.prod.exchange
15.00.0883.010; Tue, 25 Feb 2014 19:36:44 +0000
From: Derrick<Derrick.lee@xyz.co
To: "John Excel" <jexcel@abc.com>
Subject: Test
Thread-Topic: Test
Thread-Index: Ac8yYOSt96staBysRta1C6vrdI
Date: Tue, 25 Feb 2014 19:36:43 +0000
Message-ID: <aba69f29b4b74cc598456b541
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Test:
x-originating-ip: [50.1.2.23] (this is not real)
x-forefront-prvs: 01334458E5
x-forefront-antispam-repor
Content-Type: multipart/alternative;
boundary="_000_aba69f29b4b
MIME-Version: 1.0
X-OriginatorOrg: xyz.com
Any help would be really appreciated.
Thanks,
Two customer of ours are getting mail rejected from us because they are on a block list. In the past, I would add them in the Hub Transport Anti-Spam IP Allow List Providers and everything would be fine. This time it didn't resolve the issue. Is it possible that this issue isn't being caused by our Exchange server or dns/MX record misconfiguration on their part.
I observed that one of them is using the Exchange Online Protection since they have example.protection.outlook.com when queried using mxtoolbox.com and other is hosted Exchange (prod.exchange-labs.com)
Here is NDR message that external users receiving:
mail.abc.com (domain removed) rejected your message to the following email addresses:
John Excel (jexel@abc.com)
mail.abc.com gave this error:
Recipient not authorized, your IP has been found on a block list
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept email from certain senders, or another restriction may be preventing delivery.
Diagnostic information for administrators:
Generating server: BY2PR01MB361.prod.exchange
jexcel@abc.com
mail.abc.com
Remote Server returned '550 5.7.1 Recipient not authorized, your IP has been found on a block list'
Original message headers:
Received: from BY2PR01MB171.prod.exchange
BY2PR01MB361.prod.exchange
Server (TLS) id 15.0.883.10; Tue, 25 Feb 2014 19:36:44 +0000
Received: from BY2PR01MB171.prod.exchange
BY2PR01MB171.prod.exchange
15.00.0883.010; Tue, 25 Feb 2014 19:36:44 +0000
From: Derrick<Derrick.lee@xyz.co
To: "John Excel" <jexcel@abc.com>
Subject: Test
Thread-Topic: Test
Thread-Index: Ac8yYOSt96staBysRta1C6vrdI
Date: Tue, 25 Feb 2014 19:36:43 +0000
Message-ID: <aba69f29b4b74cc598456b541
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Test:
x-originating-ip: [50.1.2.23] (this is not real)
x-forefront-prvs: 01334458E5
x-forefront-antispam-repor
Content-Type: multipart/alternative;
boundary="_000_aba69f29b4b
MIME-Version: 1.0
X-OriginatorOrg: xyz.com
Any help would be really appreciated.
Thanks,
ASKER
Shredhar,
Already checked. My mail server is not blacklisted. So far only two external users mails are being rejected.
Already checked. My mail server is not blacklisted. So far only two external users mails are being rejected.
If your server is being rejected you will be found on a blocklist somewhere.
Have you checked on www.blacklistalert.org too?
Alan
Have you checked on www.blacklistalert.org too?
Alan
"Two customer of ours are getting mail rejected from us because they are on a block list. In the past, I would add them in the Hub Transport Anti-Spam IP Allow List Providers and everything would be fine."
That doesn't make sense.
If you are blocking them, then adding them to the list is fine.
If they are blocking you, then it wouldn't do.
It isn't clear whether this is INBOUND or OUTBOUND email (to you).
If it is INBOUND, then you are blocking them, and need to establish why.
If it is OUTBOUND then you are being blocked, which means you are on a blacklist. Office365 uses its own internal blacklist.
Simon.
That doesn't make sense.
If you are blocking them, then adding them to the list is fine.
If they are blocking you, then it wouldn't do.
It isn't clear whether this is INBOUND or OUTBOUND email (to you).
If it is INBOUND, then you are blocking them, and need to establish why.
If it is OUTBOUND then you are being blocked, which means you are on a blacklist. Office365 uses its own internal blacklist.
Simon.
ASKER
Just to be clear. The issue is that mail from external users (INBOUND) are being rejected by my mail server. The above mentioned NDR message is what external user is getting. It is with just two external users.
Yes, I whitelisted the IP and domain in the exchange server but still the issue does not go away.
Yes, I whitelisted the IP and domain in the exchange server but still the issue does not go away.
ASKER CERTIFIED SOLUTION
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ASKER
External user was using Office 365. Office 365 use a range of IPs and it so happened that IP of their outbound mail server was blacklisted on that particular day. Following day our mail server was able to process incoming mail from their mail server.
Thank you all for Simon and the rest for your help.
Thank you all for Simon and the rest for your help.
Go to http://mxtoolbox.com/blacklists.aspx
Perform Black list check for your domain and exchange server public ip address.
If it is balck listed them remove from RBL to restore mail flow.