Email not being delivered to all DL recipients - Reason: [{LED=250 2.1.5 RESOLVER.GRP.Expanded; distribution list expanded};{MSG=};{FQDN=};{IP=};{LRT=}]

Question

Users reporting not all recipients are receiving email sent to various DLs.
Message trace reports: Drop with this reason: Reason: [{LED=250 2.1.5 RESOLVER.GRP.Expanded; distribution list expanded};{MSG=};{FQDN=};{IP=};{LRT=}]

Message trace also reports status of: Resolved, Expanded or Failed each have the same Drop with the same reason: Reason: [{LED=250 2.1.5 RESOLVER.GRP.Expanded; distribution list expanded};{MSG=};{FQDN=};{IP=};{LRT=}]

What is the difference between these statuses? Resolved/Expanded/Failed?

Why do they have the same reason? Is this related to a mail flow rule?

What troubleshooting steps can we take to resolve this?

Thanks in advance!

Answer 1

That Drop just means that since the group was expanded, the message will be delivered to the ind users. Use Get-MessageTraceDetail in ExO to get more detail for failures sent to a list or ind user.