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i am using postfix with smtp-auth on fedora core 4 with mysql support
Problem is that if i configure outlook without the option "my server require authentication" it works fine.
But i need it to fix it with that everyone have to check this option "my server require authentication" and without this option postfix have to stop working.
Ok, so you say you want everyone to authenticate. But, surely you don't mean everyone, but rather only those clients relaying mail through the server. That is, you probably don't want to force someone to authenaticate when the person wants to send mail to you. If you agree with what I'm saying, just remove permit_mynetworks from the smtpd_recipient_restrictions list.
Looks like you're allowing plaintext passwords. That's not a good idea. You should read the SASL and the TLS READMEs on the postfix site. It'll do you good.