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Exchange 2016 - Users mail keep being stuck in a Shared Mailbox‘s outbox until someone else uses the Same Shared Mailbox

Kyoshi

1/8/23, 7:45 AM

I have come across a very unique problem that I have yet to find a solution for as even google failed me.

When User1 tries to send a mail as the shared Mailbox [email protected] the mail is being placed in the outbox and does not show up in any logs. However if User2 sends a mail as the shared Mailbox, User1‘s mail is also being send out of the outbox with no problem. At this point User1‘s mail also shows up in the logs.

What I have tried:

restart Exchange
create new mail for User1
try different outlook clients on multiple PCs
move User1‘s mailbox to a different database
assign User1‘s rights freshly (all right including send as)
copy the AD user and try it with the copy, which has the same problem as User1)

Seeing as User1Copy has the same problem as User1 I snooped through the attributes in AD and changed every attribute that was different from User2, but still it does not work.

Two days ago it randomly sent out the mail from the outbox without someone else sending a new mail (I checked the logs).

Does anyone have an idea what else I can try (besides making a new AD user for User1) or if I can access the outbox via the Exchange Server Shell?

1256

1 + 1

exchange

outlook

active-directory

Ivan_Wang

1/9/23, 6:11 AM

1. Did the user2 send emails as the shared mailbox successfully if nobody used this mailbox at the same time? Or the issue only happened on user1? 2. What happens if user1 sends emails as the shared mailbox via OWA?

Kyoshi

1/21/23, 1:11 PM

(Apologies for the very late reply) 1. No. Even if nobody else is using it, the mails keep getting stuck in the outbox. 2. The same problem occurs Using PowerShell on the exchange server I could make out that even if the Out Box is visibly empty, there is still 1 Item listed under ItemsInFolder. However I have yet to find a manage to pin down that Item. I am thinking that if I delete it, it might work.

Ivan_Wang

2/5/23, 5:19 AM

Try to restart MSExchange Transport/Frontend Transport service on your Exchange server and see if there is any difference.

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Server

Ivan_Wang

1/9/23, 6:13 AM

Check if there is a registry key DelegateSentItemsStyle added on user's client: Email remains in the Outbox when you use the DelegateSentItemsStyle registry value

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Kyoshi

1/21/23, 1:10 PM

I've checked that but there is no such registry key set. I also tested it on different machines alltogether.

Ivan_Wang

1/24/23, 10:25 AM

Because the issue also happened in OWA, the issue seems to be related with the ACL Perhaps you could add the send-as permission by running the following command and see if there is any difference: **Add-AdPermission -Identity <MailboxOrGroupNameOrDN> -User <DelegateIdentity> -AccessRights ExtendedRight -ExtendedRights "Send As"**

Kyoshi

1/27/23, 1:46 PM

We've tried that as well, but I've just now run it again in case I messed up the first time. The problem still holds.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Exchange 2016 - Users mail keep being stuck in a Shared Mailbox‘s outbox until someone else uses the Same Shared Mailbox

TH: Exchange 2016 - จดหมายของผู้ใช้ค้างอยู่ในกล่องจดหมายขาออกที่ใช้ร่วมกันจนกว่าจะมีคนอื่นใช้กล่องจดหมายที่ใช้ร่วมกันเดียวกัน

RO: Exchange 2016 - E-mailurile utilizatorilor continuă să rămână blocate în căsuța de ieșire a unei căsuțe poștale partajate până când altcineva folosește aceeași cutie poștală partajată

RU: Exchange 2016 — почта пользователей остается в папке «Исходящие» общего почтового ящика до тех пор, пока кто-то другой не воспользуется этим же общим почтовым ящиком.

VI: Exchange 2016 - Thư của người dùng tiếp tục bị kẹt trong hộp thư đi của Hộp thư dùng chung cho đến khi có người khác sử dụng Hộp thư dùng chung đó

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