need help with getting Dovecot mail server to work
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Starting point for problems has to be your logs. I wuld think they are in /var/log/maillog, but not sure for Ubuntu. Try what ever you were doing that didn't work and post the relevant section of the log. You may also need to post the output of postconf -n (don't post the whole main.cf)
Also, what domain are using? Assuming it's example.com, you will need to set mydomain, myhostname and mydestination correctly. These should work automatically, but your setting for myhostname could foul things up since I think it needs to be a fully qualified domain name (in this case, ubuntu.example.com, not just ubuntu). Comment out mydestination - the default it picks up should be fine. Try commenting out myhostname as well. If your machine is set up properly you don't need to define these.
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