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Refine description and symptoms for mail loop NDR
Updated the description for clarity and improved the wording in the symptoms section.
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Exchange/ExchangeServer/mailflow/hop-count-exceeded-possible-mail-loop.md

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---
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title: 554 5.4.14 Hop count exceeded - possible mail loop NDR for outgoing email
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description: Provides a fix for the 554 5.4.14 Hop count exceeded - possible mail loop issue in Exchange Server.
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description: Provides a fix for the 554 5.4.14 Hop count exceeded NDR.
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author: cloud-writer
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ms.author: meerak
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audience: ITPro
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ms.reviewer: v-six
2020
---
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# "554 5.4.14 Hop count exceeded - possible mail loop" NDR for outgoing email that's sent to an on-premises application in Exchange Server
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# "554 5.4.14 Hop count exceeded" NDR for outgoing email sent to an on-premises application in Exchange Server
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## Symptoms
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Consider the following scenario:
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- You added a parent domain, **contoso.com**, as an accepted domain to an on-premises Microsoft Exchange Server 2016 or 2013 environment.
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- You configure **contoso.com** as a parent domain.
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- You add the **contoso.com** parent domain as an accepted domain in an on-premises Microsoft Exchange Server 2016 or 2013 environment.
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- You have an on-premises application server domain, such as **app.contoso.com**, that is a subdomain of the parent domain.
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- You configured the parent domain to accept email messages from domains such as ***.contoso.com**.
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- You configure the parent domain to accept email messages from domains such as ***.contoso.com**.
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- You try to send an email message to the on-premises application through Exchange Server.
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In this scenario, the message cannot be sent. Instead, it loops between the Exchange Edge Transport server and Microsoft 365. Additionally, you receive a non-delivery report (NDR) that resembles the following:
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In this scenario, the message can't be sent. Instead, it loops between the Exchange Edge Transport server and Microsoft 365. Additionally, you receive a non-delivery report (NDR) that resembles the following:
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> **554 5.4.14 Hop count exceeded - possible mail loop**
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> `554 5.4.14 Hop count exceeded - possible mail loop`
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## Cause
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To fix this issue, use the following steps:
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1. Add the subdomain as an accepted domain. To do this, run the following command:
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1. Add the subdomain as an accepted domain. Run the following command:
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```powershell
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New-AcceptedDomain -DomainName app.Contoso.com -DomainType InternalRelay -Name app.contoso.com

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