How to set up sendmail properly

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http://serverfault.com – I'm trying to send mail with sendmail. As of now I have not touched the configuration files, so they are just as they were when Ubuntu installed them from the repository. When i try to send a mail it seams to work fine, except the mail never makes it to the other side, leading me to believe that the receiving server drops it as spam (well it's not in the spam folder) or untrustworthy or something similar. How I used it: andreas@Andreas-PC-Ubuntu:~$ sendmail [email protected] Test . andreas@Andreas-PC-Ubuntu:~$ /var/log/mail.log: Apr 7 01:16:21 Andreas-PC-Ubuntu sendmail[11759]: q36NGIfD0 (HowTos)