Do mails in the outbox of a mailbox still get sent with Outlook closed?

Posted on 2012-04-10
Medium Priority
Last Modified: 2012-04-10
Hi All,

Exchange version: Exchange 2007 SP3 RU5

I understand that the MSExchange Mail Submission service basically tells the HT servers to go through mailbox outboxes and submit any messages waiting to be sent. Normally this process is pretty seamless and the user would not realise it had even occured.

However, if a mailbox has several hundred messages waiting to go in the Outbox, and Outlook was closed, would it still process the mails via this method, or would Outlook need to be open for these to be sent?

It's strangely not something that has really come up for me before. From memory I think the mailbox does need to be opened in a MAPI client and the mails sent from that, but I could always be wrong.

Any insight appreciated.

Question by:chrismerritt
1 Comment
LVL 14

Accepted Solution

isaman07 earned 2000 total points
ID: 37829391
It will depend on the outlook mode, cached mode or live mode.
If cached, emails that are in the outbox, they are in the outbox, meaning they are not submitted to the exchange queue. You need to open the client so it connects to the proper exchange server to send them out. As long as outlook is closed, they will sit there, unless if they are programmed for delayed delivery.
If live, emails shouldn't get stuck in the outbox, which means a communication or authentication problem with your exchange server

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