Emails Bouncing / not going

Having issues sending and receiving some emails.

Error message below from an email unable to send. (was able to send one email to the address before this happened)

Requested rejected your message to the following email addresses:
To_user (receiving@domain.com)
Your message couldn't be delivered and there was no valid enhanced status code being issued by the remote mail system to determine the exact cause, status: '550 Requested action not taken: mailbox unavailable'.
Requested gave this error:
Requested action not taken: mailbox unavailable







Diagnostic information for administrators:
Generating server: Mail.domain.local
receiving@domain.com
Requested
Remote Server returned '550 Requested action not taken: mailbox unavailable'
Original message headers:
Received: from Mail.domain.local (192.168.94.102) by Mail.domain.local
 (192.168.94.102) with Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1034.26; Fri, 3
 Nov 2017 07:02:05 -0400
Received: from Mail.domain.local ([::1]) by Mail.domain.local ([::1]) with mapi
 id 15.01.1034.026; Fri, 3 Nov 2017 07:02:05 -0400
From: "From_User" <user@domain.com>
To: To_user <receiving@domain.com>
Subject: FW: FAP (Facilitation Alteration permit)
Thread-Topic: FAP (Facilitation Alteration permit)
Thread-Index: AdMNI6GymJLC8EW1QgCae7cDR/f4jQAAFxFQEb9nL4AABx0SAAAdplsA
Date: Fri, 3 Nov 2017 11:02:05 +0000
Message-ID: <EF01B677-88FC-4A0F-9419-B4D5363ACB3F@domain.com>
References: <28A39883DE0455419A684B305C781C30019980255A@GaiaIncMail.Gaiainc.bb>
 <b21bc43ad60141ed9ba3ee19f0c716a8@BLUPR6502MB0098.020d.mgd.msft.net>
 <0C328C2B-51B3-499D-BCE7-E01C032BC248@domain.com>
 <90b1cd8acee04009a047afc1ea486a7f@BY2PR6502MB0102.020d.mgd.msft.net>
In-Reply-To: <90b1cd8acee04009a047afc1ea486a7f@BY2PR6502MB0102.020d.mgd.msft.net>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [192.168.94.48]
Content-Type: multipart/alternative;
      boundary="_000_EF01B67788FC4A0F9419B4D5363ACB3Fdomaincom_"
MIME-Version: 1.0
sf1eldsAsked:
Who is Participating?
 
Hemil AquinoNetwork EngineerCommented:
Email place in draft means DNS issue, check the bindings.

Make sure internal it's your dns server and external your public dns.
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Brian BEE Topic Advisor, Independant Technology ProfessionalCommented:
Are other addresses working? Sounds like a problem with the recipient's mail server.
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sf1eldsAuthor Commented:
Yes other emails work. However I've also had other email addresses that I'm unable to send to.....or they send to me. It's not consistent.
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PRADIIP SINGHCommented:
Reply to their email and see what happens also try sending an email from OWA Let's and see

Also you can try sending an email from public domain to the recipient who you are unable to send and check the behaviour this would help to rule out if the issue is specific to your domain
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Hemil AquinoNetwork EngineerCommented:
Here is your hint

Remote Server returned '550 Requested action not taken: mailbox unavailable'

That means the remote site maybe is having issue with their mailbox-database or the user mailbox it's corrupted.
Reason why you are getting bounce back.

It's that only happening to that particular domain?
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Brian BEE Topic Advisor, Independant Technology ProfessionalCommented:
When a message they send to you fails, are they getting a similar NDR message? Send and receive issues are usually two different problems unless... Check that your external DNS settings are correct for MX and reverse lookup.

I see where Pradiip is also going with his idea... Is your external recipient having problems with anyone else?
Replying to a message they sent you instead of sending a new message will tell us if perhaps you have a corrupted address saved.
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Hemil AquinoNetwork EngineerCommented:
Since the fact he got a reply from the remote server that means his MX record are in place. But the remote user is having issue. To me seems like it's the other end issue, not yours. Unless you are telling me that is happening with every domain you send emails.

Based on my experience, if it was a DNS issue, he'll see a different error such as:

1- The following domain can't be found
2- The following email couldn't be reached, check MX etc..
3- His email will be placed in draft not delivered.
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sf1eldsAuthor Commented:
PRADIIP SINGH:
If I reply it works sometimes.
If I send from public domain it works.

Hemil Aquino:
Happens with multiple domains
I did have a case with my email placed in draft not delivered.
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Brian BEE Topic Advisor, Independant Technology ProfessionalCommented:
Thanks for the update. So to my question, what is the error message if someone can't send to you?
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sf1eldsAuthor Commented:
I'll go take a look at my reverse DNS
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sf1eldsAuthor Commented:
Brian B:
571 Delivery not authorized, message refused
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Brian BEE Topic Advisor, Independant Technology ProfessionalCommented:
Any chance that you scan (spam/virus) your inbound and outbound mail? Can you find any record of these "problem messages" in either direction and if they were allowed to pass?
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Hemil AquinoNetwork EngineerCommented:
If it says tore bot authorized, it means you still having dns issue
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PRADIIP SINGHCommented:
Enable the transport log and see
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Brian BEE Topic Advisor, Independant Technology ProfessionalCommented:
Thanks for closing the question but for the benefit of others would you mind sharing the solution?
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sf1eldsAuthor Commented:
I’m sorry I thought I selected the solutions.

I had to set my internal IP to my dns server and external IP to my public dns.

Also needed to configure my DNS reverse lookup.
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