Outgoing mail is not working on the Macbook Pro

Hey
I am using the mail client to read my gmail mails in my Macbook Pro. Incoming and outgoing emails were working fine and all of a sudden for the last 2 days my outgoing mails are not working and i get this error" the sender address blah blah.com was rejected by the server".
I reentered my cred in the pref pane and it still does not work. I am able to send mails fine using the browser. Incoming mails is fine is fine on the client.
Any idea what is causing this error?
Thanks
Rpk
Mac Mini, MacBook Pro   Mac OS X (10.4.5)  

I'm not sure why this worked fine for a period of time but most, if not all ISPs use for connecting to the internet block the use of SMTP servers outside of their network (or not provided by the ISP) on Port 25. Some ISPs allow the use of an authenticated SMTP server only that is outside of their network on Port 25 but some block its use regardless.
These restrictions are in place as part of an overall effort to prevent spam emanating from the ISP's domain.
Something to try.
Go to Mail > Preferences > Accounts and under the Account Information tab for the account preferences at the SMTP server selection, select the Server Settings button below.
Enter 587 in place of 25 in the Server Port field and when finished, select OK to save the changed setting.
If this doesn't work, you need to add your ISP's SMTP server to mail and select this SMTP server to send mail with your gmail account which is invisible to all recipients.

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