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I have a strange problem: I have a mail-server. And I have a strange issue with hostnames on ubuntu. When I send an e-mail there is a line in the headers: Received from domain (ip6-localhost [127.0.0.1]) but my hosts file does not have domain.com The domain does not really fit in since domain.com was just for testing and I want to get rid of this! /etc/hosts and etc/hostname do not have an entry for domain.com. /etc/mailname too Any ideas? (Reverse DNS is okay)

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It's probably specified in the configuration file. Assuming this is postfix, make sure /etc/postfix/main.cf contains:

mydomain = yourdomain.net
myhostname = yourdomain.net
myorigin = $mydomain

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