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I'm wondering if I can get some help. I have changed the hostname in etc/hostname on ubuntu server 10.04. I use this server as a mail server.
The problem is when I send email out, it still showed the old hostname + domain name. I do not know if this is to do with caching. I rebooted the machine a few times hoping that it would clear the cache or something but the same problem still happens.
Where exactly you see this "old hostname + domain name" in your mail? Can you post relevant header fields (with masked sensitive data of course)? Maybe this is just your revDNS entry resolved by mail server.
I checked the mailname under /etc and it turned out that it still had the previous hostname. So I went to change it and restart both postfix and dovecot. All good so far.
However, after sending an email from squirrelmail to my Yahoo account for a test, I can see that the mail has the right FQDN. Then, I went to reply from Yahoo back to my mail server, I immediately received a bounced back Failure Notice email with the message
Sorry, we were unable to deliver your message to the following address.
Remote host said: 550 5.1.1 <email@example.com>: Recipient address rejected: User unknown in local recipient table [RCPT_TO]
I wonder what the error means. Which recipient table is it talking about? I have users added to LDAP server.