[kubuntu] kmail doesn't work with wireless

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http://ubuntuforums.org – Hi all, I use kmail in kubuntu 8.04. Whenever I have a wired connection, kmail checks email and sends messages just fine. However, any time I switch to wireless, kmail just says "No new messages," without even checking. I am also unable to send email over wireless. I've tried searching the internet for people with similar problems, but to no avail. Any help would be greatly appreciated. Thanks! (HowTos)