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-   -   Postfix authenticate on forward to smtp server (

LWillmann 12-13-2007 09:23 AM

Postfix authenticate on forward to smtp server
I have to have my postfix server forward all mail to my ISP's smtp server. They have instituted smtp authentication. How do I configure Postfix to authenticate with my ISP's smtp server so that I can get my mail sent properly? As of right now, all mail is being rejected.

Berhanie 12-14-2007 09:28 AM

Read this. You'd need a postfix compiled with Cyrus SASL.

digitalnerds 12-16-2007 09:09 PM


relayhost = isp.mail.server
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/isppasswd
smtp_sasl_security_options =

then you will need to create the /etc/postfix/isppasswd file with the content:


isp.mail.server    username:password
and hash it afterwards by:


postmap /etc/postfix/isppasswd


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