I have been searching the web days and weeks and now I hope to find somebody who can help me. I configured everything as explained in the article, but sendmail is not working. So - I must have done wrong something. Here is what my terminal is telling me:
[goofy:~] stephanv% mail -v firstname.lastname@example.org
email@example.com... Connecting to localhost via relay...
220 goofy.local. ESMTP Sendmail 8.12.2/8.12.2; Mon, 18 Nov 2002 00:34:07
>>> EHLO goofy.local
250-goofy.local. Hello localhost [127.0.0.1], pleased to meet you
>>> MAIL From:<firstname.lastname@example.org>
451 4.3.0 Temporary system failure. Please try again later.
email@example.com... Deferred: 451 4.3.0 Temporary system failure. Please try
Closing connection to localhost
221 2.0.0 goofy.local. closing connection
What is the problem???