Outgoing mail suddenly rejected by ISP

since 5/6 days my outgoing mail is rejected by ISP and stays in the outbox after all worked fine for several month.
Browsing the internet like being here..... receiving mail from a different account all works fine, through the same wireless ISP connection, which suddenly rejects my outgoing mail.
here are some screenshots
confusing is that Airport Utilities can't find any wireless devise , even so I am using it, see screenshot
can somebody help????

I could sort my e-mail out today, the problem, was with the ISP new setting arrangement
about, there are two questions left :
b) Also why I was using the TPG wireless internet connection on the 02.05.2011 @ ca.1150pm, my macbook pro brought up a message like"somebody is using your (my computers) IP address, the settings changed". Can you make any sense of this or explain, what has happened???
c)Also, when I bring up my 'Airport Utility', while I am connected to TPG and even actively browsing the net on wireless it say's " it can't detect wireless devices (see screen shot above)

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Why has mail suddenly started saying that my outgoing mail server is offline?
I can receive mail from my ISP using Apple Mail but as of this morning I can't send via my ISP.
When I check Mail preferences, they say that my ISP's outgoing mail server is "offline".
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Hello all. Hope you can help with this one.
I was using Mail as normal yesterday. I use the same incoming mail server and SMTP server (my university's Exchange server). Then sending mail suddenly failed. The error message I get is:
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May be no help to you Aidan except comfort in numbers. Mail has started behaving erratically for me in the past week. My inbox and account mail has disappeared and my accounts keep being rejected by the webmail host similar to your problem; password rejected etc. Then Mail closes abruptly telling me there's a problem and offering to send a report to Apple. Mail is version 4.5 and the iMac is 10.6.8. Help!
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Outgoing mail suddenly rejected by ISP

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