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i am quite new so please be a bit patient XD i am trying to configure a mail server using postfix (which implements a database for aliases, domains and mailboxes) and courrier on ubuntu. I have this problem when i test the command telnet: 451 4.3.0 : Temporary lookup failure I followed this guide: http://guide.debianizzati.org/index.php/Postfix-mysql#Postfix

Do you know how can i solve this problem? Tell me which log and configuration file do you needn to know. Thanks for help.

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What are you trying to do? Send a test email through telnet? The syntax is "telnet $host $port" and in your case, "telnet localhost 25" if you've got postfix configured correctly as your default MTA and it is working correctly.

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  • yes i am trying to send a test mail but it doesnt seem to be correct and i dont know why. the process is listening but when i try mail from: and mail to: i receveid that error.
    – angeldvl
    May 3, 2014 at 9:38

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