postfix config

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http://www.linuxquestions.org – hello. iv'e been working on setting up an email server. I'm using ubuntu server 10.04LTS adminstrated mostly in webmin. I can send email from the terminal in the server. i can receive email using pop in live mail and thunder bird. when i try to send mail, it fails. mail.log either says that there was a SASL error, no valid NTLM response received, or it wont say anything, depending on how i have thing configured in the client. attached are the config files for postfix. thanks for any and all help, i have been banging my head against this for a f (HowTos)