Linux Mail Server Setup and Howto Guide

Dear All, i have followed the manual to create a virtual mail server (postfix,dovecot, mysql, squirrelmail), but the weird thing is, everything seems to be ok. i can log in, send mails to another domain, but i cant find anymails in the inbox, even if i send from a local account (virtual user).

Here is my postconf -n output

command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
debug_peer_level = 2
html_directory = no
inet_interfaces = all
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydestination = $myhostname, localhost.$mydomain, localhost,
tessua.udsm.ac.tz
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES
sample_directory = /usr/share/doc/postfix-2.3.3/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
unknown_local_recipient_reject_code = 550
virtual_alias_maps = mysql:/etc/postfix/mysql-aliases.cf
virtual_gid_maps = static:501
virtual_mailbox_base = /home/vmail
virtual_mailbox_domains = mysql:/etc/postfix/mysql-domains.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql-users.cf
virtual_uid_maps = static:501

and /var/log/maillog gives nothing, than

Nov  8 13:55:44 tessua postfix/qmgr[6192]: 3B61D36BF7:
from=<kagame@tessua.udsm.ac.tz>, size=1703, nrcpt=1 (queue active)
Nov  8 13:55:44 tessua postfix/smtpd[6615]: disconnect from
localhost.localdomain[127.0.0.1]
Nov  8 13:55:44 tessua dovecot: imap-login: Login:
user=<kagame@tessua.udsm.ac.tz>, method=PLAIN, rip=::ffff:127.0.0.1,
lip=::ffff:127.0.0.1, secured
Nov  8 13:55:44 tessua postfix/smtp[6624]: 3B61D36BF7:
to=<etessua@uccmail.co.tz>, relay=mx1.udsm.ac.tz[196.44.168.12]:25,
delay=0.21, delays=0.09/0.08/0.02/0.01, dsn=2.0.0, status=sent (250 2.0.0
Ok: queued as 1ABFE25D3D3)
Nov  8 13:55:44 tessua postfix/qmgr[6192]: 3B61D36BF7: removed
Nov  8 13:55:44 tessua dovecot: IMAP(kagame@tessua.udsm.ac.tz):
Disconnected: Logged out
Nov  8 13:55:44 tessua dovecot: imap-login: Login:
user=<kagame@tessua.udsm.ac.tz>, method=PLAIN, rip=::ffff:127.0.0.1,
lip=::ffff:127.0.0.1, secured
Nov  8 13:55:44 tessua dovecot: IMAP(kagame@tessua.udsm.ac.tz):
Disconnected: Logged out
Nov  8 13:56:43 tessua dovecot: imap-login: Login:
user=<kagame@tessua.udsm.ac.tz>, method=PLAIN, rip=::ffff:127.0.0.1,
lip=::ffff:127.0.0.1, secured
Nov  8 13:56:43 tessua dovecot: IMAP(kagame@tessua.udsm.ac.tz): Disconnected:

What could be the problem??