Office 365 sent email showing as expanded

[0x9h3]

Hi,

 

I am having a weird issue with teams groups. When someone sends an email to this group it shows as being expanded in mail trace. Does anyone have any ideas as to the cause and hopefully a fix to this issue?

 

We are completely cloud based office 365.

 

Thanks,

[HPlum78]

So expanded in mail status essentually means that the mail has hit a DL and has then been sent to the members of that DL, so in my mind without any digging or knowing anything about your own config the status would seem entirely plausible. Is the mail not being delivered to the recipients as you would expect?

[0x9h3]

Hi HPlum78,

 

No, the users are not receiving the email as expected. We are entirely cloud based and the emails are being sent to the same domain (Office 365 tenant). Thanks,

 

 

 

So expanded in mail status essentually means that the mail has hit a DL and has then been sent to the members of that DL, so in my mind without any digging or knowing anything about your own config the status would seem entirely plausible. Is the mail not being delivered to the recipients as you would expect?

[HPlum78]

Can you post/ send me the message trace and the header from a mail that has been sent to one of these teams that has failed please, i will see if i can make sense of it.