Problem with sending emails, yet recieving = just fine..

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Im having a problem with sending emails from the email application on my Xperia X10.
This service has worked flawlessly for me over the past week, though it has suddenly stopped, and I am all out of ideas..
I can still recieve new emails..yet when I reply..or try to send a new email.. it just sits there in the outbox, and the outbox tab shows connection error as shown in the picture below.



There doesnt seem to be any way for me to check what this connection error is, as there is no long press action, nor does the options button on the bottom left help..

What I've tried:
Ive tried deleting and re-adding my email account.. I've checked the settings and made sure they are the same as my bro's N900, (and my x1 has no poblems sending emails either..so its not the account..)

I have also tried manually entering the settings listed in the following link.
http://liveunplugged.spaces.live.com...90CA!422.entry

Anyone have any ideas? I'm sure other peoples emails work, just like mine have done over the last few days, I just dont know what to do now..

Any help would be appreciated

I had the same problem with POP mail until I ticked the -Account settings- Outgoing server settings - Requires sign in, then fill in the boxes.

Now I can send as well as receive.

probably wrong smtp setting.

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You need to use your operators SMTP server, this solves your problem.
so if you use hotmail, set inbound server details for hotmail but outbbound for the phonecompany you use.