reply to axial
Re: Dial-up mail sending problem w/ OSX 10.4 deleting the preference file would delete a lot of other information as well including his incoming server settings.
I would suggest deleting just the smtp server and add it back. This can be done in the SMTP server list. Just select the server in the box at the top and then click the (-) button. To add it back click the (+) and update the info accordingly.