Can receive but not send messages

Can anyone help me? My imessage for Mac was working great yesterday then all the sudden I can't send messages. I tried sending messages to someone's email account and to a phone number. I am logged in with my Apple ID and also with my email address through AIM. However, I can get messages, but when I send, I get that red exclamation mark. So I click on it to resend and it still won't send.
I've tried restarting iMessage, my computer, changing my passwords, closing the conversation... not sure what else to try. I'm running OSX 10.8.3.
Any suggestions?!

hi,
Based on the email , the three other threads that have other bits of info in them I would also try a PRAM reset.
Shut down the computer.
Restart it holding down Apple/CMD ( or ⌘)+ALT( ⌥)+P+R Keys until you have heard three Start Up Bongs.
10:16 PM Saturday; April 27, 2013
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.3)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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Anyone experiencing problems sending mail using Apple Mail viaTalkTalk - can receive but not send - was ok up until pm 24/08/12 - have recently loaded Mountain Lion patch could this be the problem?

jag157 wrote:
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When you set them up, did you set up both the incoming and outgoing email servers separately, and did you enter the correct SMTP server name, and enter your userid and password even though it says "optional"?
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http://support.apple.com/kb/TS3899
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http://ipadhelp.com/ipad-help/ipad-cant-send-emails-troubleshooting-steps/
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http://www.apple.com/support/ipad/assistant/mail/
Using a POP account with multiple devices
http://support.apple.com/kb/ht3228
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http://support.apple.com/kb/HT4810
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http://support.apple.com/kb/ht1694
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 Cheers, Tom

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Settings
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Relieved but irritated,
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http://support.apple.com/kb/TS3899
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 Cheers, Tom

Can receive but not send messages

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