Deleted the mail.log file and rebooted the system. Here you have the new mail.log file. The system tries to send a mail message when the cron jobs finish:
Feb 15 10:50:01 ubuntu amavis[1016]: starting. /usr/sbin/amavisd-new at ubuntu.laboratoriosacme.com amavisd-new-2.6.5 (20110407), Unicode aware
Feb 15 10:50:01 ubuntu amavis[1016]: Perl version 5.014002
Feb 15 10:50:02 ubuntu amavis[1092]: Net::Server: Group Not Defined. Defaulting to EGID '120 120'
Feb 15 10:50:02 ubuntu amavis[1092]: Net::Server: User Not Defined. Defaulting to EUID '112'
Feb 15 10:50:02 ubuntu amavis[1092]: Module Amavis::Conf 2.208
Feb 15 10:50:02 ubuntu amavis[1092]: Module Archive::Zip 1.30
Feb 15 10:50:02 ubuntu amavis[1092]: Module BerkeleyDB 0.49
Feb 15 10:50:02 ubuntu amavis[1092]: Module Compress::Zlib 2.033
Feb 15 10:50:02 ubuntu amavis[1092]: Module Convert::TNEF 0.17
Feb 15 10:50:02 ubuntu amavis[1092]: Module Convert::UUlib 1.4
Feb 15 10:50:02 ubuntu amavis[1092]: Module Crypt::OpenSSL::RSA 0.27
Feb 15 10:50:02 ubuntu amavis[1092]: Module DBD::mysql 4.020
Feb 15 10:50:02 ubuntu amavis[1092]: Module DBI 1.616
Feb 15 10:50:02 ubuntu amavis[1092]: Module DB_File 1.821
Feb 15 10:50:02 ubuntu amavis[1092]: Module Digest::MD5 2.51
Feb 15 10:50:02 ubuntu amavis[1092]: Module Digest::SHA 5.61
Feb 15 10:50:02 ubuntu amavis[1092]: Module IO::Socket::INET6 2.69
Feb 15 10:50:02 ubuntu amavis[1092]: Module MIME::Entity 5.502
Feb 15 10:50:02 ubuntu amavis[1092]: Module MIME::Parser 5.502
Feb 15 10:50:02 ubuntu amavis[1092]: Module MIME::Tools 5.502
Feb 15 10:50:02 ubuntu amavis[1092]: Module Mail:

KIM::Signer 0.39
Feb 15 10:50:02 ubuntu amavis[1092]: Module Mail:

KIM::Verifier 0.39
Feb 15 10:50:02 ubuntu amavis[1092]: Module Mail::Header 2.08
Feb 15 10:50:02 ubuntu amavis[1092]: Module Mail::Internet 2.08
Feb 15 10:50:02 ubuntu amavis[1092]: Module Mail::SPF v2.008
Feb 15 10:50:02 ubuntu amavis[1092]: Module Mail::SpamAssassin 3.003002
Feb 15 10:50:02 ubuntu amavis[1092]: Module Net:

NS 0.66
Feb 15 10:50:02 ubuntu amavis[1092]: Module Net::Server 0.99
Feb 15 10:50:02 ubuntu amavis[1092]: Module NetAddr::IP 4.058
Feb 15 10:50:02 ubuntu amavis[1092]: Module Socket6 0.23
Feb 15 10:50:02 ubuntu amavis[1092]: Module Time::HiRes 1.972101
Feb 15 10:50:02 ubuntu amavis[1092]: Module URI 1.59
Feb 15 10:50:02 ubuntu amavis[1092]: Module Unix::Syslog 1.1
Feb 15 10:50:02 ubuntu amavis[1092]: Amavis:

B code loaded
Feb 15 10:50:02 ubuntu amavis[1092]: Amavis::Cache code loaded
Feb 15 10:50:02 ubuntu amavis[1092]: SQL base code loaded
Feb 15 10:50:02 ubuntu amavis[1092]: SQL::Log code NOT loaded
Feb 15 10:50:02 ubuntu amavis[1092]: SQL::Quarantine NOT loaded
Feb 15 10:50:02 ubuntu amavis[1092]: Lookup::SQL code loaded
Feb 15 10:50:02 ubuntu amavis[1092]: Lookup::LDAP code NOT loaded
Feb 15 10:50:02 ubuntu amavis[1092]: AM.PDP-in proto code loaded
Feb 15 10:50:02 ubuntu amavis[1092]: SMTP-in proto code loaded
Feb 15 10:50:02 ubuntu amavis[1092]: Courier proto code NOT loaded
Feb 15 10:50:02 ubuntu amavis[1092]: SMTP-out proto code loaded
Feb 15 10:50:02 ubuntu amavis[1092]: Pipe-out proto code NOT loaded
Feb 15 10:50:02 ubuntu amavis[1092]: BSMTP-out proto code NOT loaded
Feb 15 10:50:02 ubuntu amavis[1092]: Local-out proto code loaded
Feb 15 10:50:02 ubuntu amavis[1092]: OS_Fingerprint code NOT loaded
Feb 15 10:50:02 ubuntu amavis[1092]: ANTI-VIRUS code loaded
Feb 15 10:50:02 ubuntu amavis[1092]: ANTI-SPAM code loaded
Feb 15 10:50:02 ubuntu amavis[1092]: ANTI-SPAM-EXT code NOT loaded
Feb 15 10:50:02 ubuntu amavis[1092]: ANTI-SPAM-C code NOT loaded
Feb 15 10:50:02 ubuntu amavis[1092]: ANTI-SPAM-SA code loaded
Feb 15 10:50:02 ubuntu amavis[1092]: Unpackers code loaded
Feb 15 10:50:02 ubuntu amavis[1092]: DKIM code loaded
Feb 15 10:50:02 ubuntu amavis[1092]: Tools code NOT loaded
Feb 15 10:50:02 ubuntu amavis[1092]: Found $file at /usr/bin/file
Feb 15 10:50:02 ubuntu amavis[1092]: No $altermime, not using it
Feb 15 10:50:02 ubuntu amavis[1092]: Internal decoder for .mail
Feb 15 10:50:02 ubuntu amavis[1092]: No decoder for .F
Feb 15 10:50:02 ubuntu amavis[1092]: Found decoder for .Z at /bin/uncompress
Feb 15 10:50:02 ubuntu amavis[1092]: Internal decoder for .gz
Feb 15 10:50:02 ubuntu amavis[1092]: Found decoder for .bz2 at /bin/bzip2 -d
Feb 15 10:50:02 ubuntu amavis[1092]: Found decoder for .lzo at /usr/bin/lzop -d
Feb 15 10:50:02 ubuntu amavis[1092]: No decoder for .rpm tried: rpm2cpio.pl, rpm2cpio
Feb 15 10:50:02 ubuntu amavis[1092]: Found decoder for .cpio at /bin/pax
Feb 15 10:50:02 ubuntu amavis[1092]: Found decoder for .tar at /bin/pax
Feb 15 10:50:02 ubuntu amavis[1092]: Found decoder for .deb at /usr/bin/ar
Feb 15 10:50:02 ubuntu amavis[1092]: Internal decoder for .zip
Feb 15 10:50:02 ubuntu amavis[1092]: No decoder for .7z tried: 7zr, 7za, 7z
Feb 15 10:50:02 ubuntu amavis[1092]: No decoder for .rar tried: unrar-free
Feb 15 10:50:02 ubuntu amavis[1092]: Found decoder for .arj at /usr/bin/arj
Feb 15 10:50:02 ubuntu amavis[1092]: Found decoder for .arc at /usr/bin/nomarch
Feb 15 10:50:02 ubuntu amavis[1092]: Found decoder for .zoo at /usr/bin/zoo
Feb 15 10:50:02 ubuntu amavis[1092]: No decoder for .lha
Feb 15 10:50:02 ubuntu amavis[1092]: No decoder for .doc tried: ripole
Feb 15 10:50:02 ubuntu amavis[1092]: Found decoder for .cab at /usr/bin/cabextract
Feb 15 10:50:02 ubuntu amavis[1092]: No decoder for .tnef
Feb 15 10:50:02 ubuntu amavis[1092]: Internal decoder for .tnef
Feb 15 10:50:02 ubuntu amavis[1092]: Found decoder for .exe at /usr/bin/arj
Feb 15 10:50:02 ubuntu amavis[1092]: Using primary internal av scanner code for ClamAV-clamd
Feb 15 10:50:02 ubuntu amavis[1092]: Found secondary av scanner ClamAV-clamscan at /usr/bin/clamscan
Feb 15 10:50:02 ubuntu amavis[1092]: Creating db in /var/lib/amavis/db/; BerkeleyDB 0.49, libdb 5.1
Feb 15 10:50:05 ubuntu postfix/postqueue[1373]: warning: Mail system is down -- accessing queue directly
Feb 15 10:50:22 ubuntu postfix/master[1819]: daemon started -- version 2.9.3, configuration /etc/postfix
Feb 15 10:52:22 ubuntu postfix[2201]: fatal: usage: postfix [-c config_dir] [-Dv] command
I'm repeating the setup on another computer just to verify if the steps described in the guide have a mistake.
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