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cannot send mail to localhost with postfix: Temporary lookup failure

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http://askubuntu.com – I removed postfix, tried Apache James, removed James, and now cannot get postfix working again: to my knowledge, I'm using postfix correctly as so: thufir@dur:~$ thufir@dur:~$ telnet localhost 25 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 dur.bounceme.net ESMTP Postfix (Ubuntu) ehlo test 250-dur.bounceme.net 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN quit 221 2.0.0 Bye Connection closed by foreign host. thufir@dur:~$ Possibly the problem is that sendmail isn't working: thufir@dur:~$ thufir@ (HowTos)