Issue sending e-mail with Microsoft Outlook 2007

Any time I try to send an email from my e-mail client (Outlook) I received this message: the following recipient s cannot be reached .... address rejected

When I go to the settings and put the pop and smtp server, and I click on test it seems to be working fine, but ones I try to use the client I received e-mail without problems, but I am unable to send any.

I have been googling without success, an it seems to be a bug in Outlook, but I already have the SP1 installed.

I appreciate any help.
midelafeAsked:
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JohnBusiness Consultant (Owner)Commented:
Do you have to authenticate email that you send?

Take a look at this setting and see if you need to make an entry.

 Outlook-2010-New3
... Thinkpads_User
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haossCommented:
there is also sp2 for outlook 2007
http://www.microsoft.com/download/en/details.aspx?id=5
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Mohammed RahmanCommented:
You may also need to change the SMTP port number to 587 under advanced (in the pic above).
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JohnBusiness Consultant (Owner)Commented:
Thank you. I was pleased to assist. ... Thinkpads_User
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