It’s hard to tell, a couple of questions as well below,
1) It sounds like you’re running remote desktop to get the server, is that right? When you go to leave, are you going to “log off” or just closing the session window on your side?
Logging off will stop all programs you have open. Just closing the session will leave you logged in and everything running as you have left it. The easiest way to tell for sure is if you go to log in next time, and all your programs are still up and running, then you’ve just closed the session. It also lets you know nothing else is logging you off.
Depending on the configuration and purpose of the server, even if you’re just closing the session, they may either power it down every so often, log all active accounts off to run backups, or even have a maximum time for security purposes.
2) Do you know if they use an Exchange server? It should let you know under the Tools -> Account Settings (menus vary), if it’s Exchange, then it may accept your message to delivery later even if you’re not logged in.
If it’s POP3 or IMAP it won’t and unless you’re still seeing outlook running (and the mail in your outbox) when you first log into the server again, this isn’t going to work.
Can you get the mail on your own computer somehow instead? If people get the mail anywhere off the internal network, then the answer is probably yes. It would really simplify things and give you more control.
3) What version of outlook? There are two ways to delay messages on the one I have in front of me (2007) and a quick look online shows their basically the same on different versions, but there are a few quirks.
Neither is really meant for what you’re trying to do. One delays messages until the first “Send/Receive” after a date and time, and the other delays messages a certain number of minutes in case you want an “ohhh shit” period to correct mistakes.
It looks like there are some third party plugins that might help.
SendLater looks promising, and has a free version. I haven’t used it, but says it doesn’t need to be running to send. Not sure if that’s accurate or marketing, but worth a shot.
This is getting long, so I’ll leave it at that. For what it’s worth, I have the same problem, and ended up directing everything through gmail (you can send from other accounts) and then using Boomerang for Gmail to deliver messages without freaking people out that I’m up at 4am.
Now if I could just get them to quit calling my cell to follow up right at 8:02am because they “just got my email”... ;)