554 5.4 6 hop count exceeded possible mail loop
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Looking at it further, it only appears to happen with the quarantine report. Show The UTM sends the spam quarantine report out to the user. The user has an automatic reply set (as they are away) which is then forwarded back to the UTM. It then appears the UTM sends the quarantine report again (and then the auto reply) and so on until it bounces due to a mail loop. Normal email to the user (from internal (doesn't hit UTM) & external) doesn't have this behavior and responds as it should. Even with the above happening, the user only gets one quarantine report in their inbox so it's not flooding it. Log below: 2016:05:03-07:00:24 UTM01-1 exim-out[9258]: 2016-05-03 07:00:24 1axTNJ-0002Jv-0l => P=<>
R=static_route_hostlist T=static_smtp H=10.1.2.100 [10.1.2.100]:25 X=TLSv1:ECDHE-RSA-AES256-SHA:256 C="250 2.6.0 <> [InternalId=227116] Queued mail for delivery" Permalink Cannot retrieve contributors at this time 554 5.4.14 Hop count exceeded - possible mail loop NDR for outgoing email Provides a fix for the 554 5.4.14 Hop count exceeded - possible mail loop issue in Exchange Server. simonxjx ITPro troubleshooting v-six dcscontentpm Normal
Exchange Server CSSTroubleshoot MET150
Exchange Server 2016 Exchange Server 2013 3/31/2022 Consider the following scenario: In this scenario, the message cannot be sent. Instead, it loops between the Exchange Edge Transport server and Exchange Online Protection (EOP). Additionally, you receive
a non-delivery report (NDR) that resembles the following: 554 5.4.14 Hop count exceeded - possible mail loop This issue occurs because the Exchange Edge server cannot associate the SMTP address space for the application as a subdomain to the accepted domain. This is true even though the accepted domain is configured as a parent domain. In this scenario, the subdomain would be part of the address space in the EdgeSync - Inbound to SiteName send connector. ResolutionTo fix this issue, follow these steps:
What does hop count exceeded possible mail loop mean?The message "Too many hops" means that the email went through to several mail servers before it went to the last one that rejected it.
What does 554 5.4 14 hop count exceeded?This issue occurs because the Exchange Edge server cannot associate the SMTP address space for the application as a subdomain to the accepted domain. This is true even though the accepted domain is configured as a parent domain.
What is a hop count in email?The hop count refers to the number of mail servers a message passes through on its journey from the sender to the recipient. Unfortunately, there is no way one can control the number of mail servers through which an email passes until it reaches its final recipient server.
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