If you can receive mail but aren't able  to send this means one thing.....
 
 Your internet provider is  blocking you from using anyone's outgoing mail servers but their own.  Many major ISP's are blocking outgoing emails. The reason they do this  is to prevent you from using their internet connection for spamming  purposes. You will still be able to send emails, but only by using your  ISP'S outgoing mail server. Every ISP's outgoing mail address is  different, but for the most part they will be mail.yourispname.com For  example, if you had hosting with AOL.com, their outgoing mail server  would look like this: mail.aol.com If mail.yourisp.com does not work and  you are still unable to send emails, you will need to call your  internet service provider to find out what their outgoing mail server  is.
 
 We also have exim running on port 26 for this  very reason. A possible work around is to change your outgoing mail to  port 26
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