Outlook 2003 slow send/receive

Hello,
Im new to these forums and just wandered if anyone knew/is experiancing the same problem as me.

I dont think that this is a problem with the actual send/Receive function, but thats all i can think of. When i send a message from a couple of people's computer (about 3/4 out of nearly 40) the message sticks in their outbox, though the other person actually receives it. And the same people also have to click out of the inbox every once in a while to check messages, as they dont arrive when its just there, they have to click, say, sent items and then any e-mails that were sent to them arrive while they are in sent.

I have checked all options and compared to my own computer, which works normally, and the settings are all the same. Bit of an annoyance, but i have searched all over the place and at every turn im left at square one!

 

There isnt a SMPT setting part to it. Or am i looking in the wrong place (Control Panel > mail > view or change account > more settings > advanced > ?).

 

I am on exchange server. Any other idea's?

 

I did a detect and repair straight away and no change. The e-mails send but stay in your outbox untill you click onto a differant folder, of close outlook. And she has no signature.

Office update has been run fully also.
Sorry for being a pain, but this is really bugging me!