here is my main.cf under /etc/postfix and i think its where the problem but i have failed to figured out

# See /usr/share/postfix/main.cf.dist for a commented, more complete version


# Debian specific: Specifying a file name will cause the first
# line of that file to be used as the name. The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# TLS parameters
smtpd_tls_cert_file = /etc/ssl/certs/mail.build-africauganda.org.crt
smtpd_tls_key_file = /etc/ssl/private/mail.build-africauganda.org.key
#smtpd_use_tls = yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.

smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_rbl_client zen.spamhaus.org,reject_rbl_client bl.spamcop.net,reject_rbl_client cbl.abuseat.org, permit
myhostname = mail.build-africauganda.org
mydomain = build-africauganda.org
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = localhost.$mydomain, mail.build-africauganda.org, build-africauganda.org, mail, localhost.localdomain, localhost
mynetworks = 212.88.98.60/30 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 192.168.1.0/24
# mailbox_command = procmail -a "$EXTENSION"
mailbox_command = /usr/lib/dovecot/deliver
mailbox_size_limit = 0
recipient_delimiter = +
home_mailbox = Maildir/
smtpd_tls_auth_only = no
smtpd_tls_CAfile = /etc/ssl/certs/cacert.pem
tls_random_source = dev:/dev/urandom

#smtpd_sasl_auth_enable = yes
#broken_sasl_auth_clients = yes
#smtpd_sasl_security_options = noanonymous
#smtpd_tls_security_level = encrypt
#smtpd_sasl_type = dovecot


when u compose a mail and send, it shows as if it has been sent but it doesnt reach the recipient.

FROM MAIL.LOG sample

Mar 29 01:04:38 mail postfix/smtpd[21806]: connect from mail-eopbgr00120.outbound.protection.outlook.com[40.107.0.120]
Mar 29 01:04:39 mail postfix/smtpd[21806]: NOQUEUE: reject: RCPT from mail-eopbgr00120.outbound.protection.outlook.com[40.107.0.120]: 550 5.1.1 <obwola@build-africauganda.org>: Recipient address rejected: User unknown in local recipient table; from=<rnambooze@UAP-GROUP.COM> to=<obwola@build-africauganda.org> proto=ESMTP helo=<EUR02-AM5-obe.outbound.protection.outlook.com>
Mar 29 01:04:39 mail postfix/smtpd[21806]: NOQUEUE: reject: RCPT from mail-eopbgr00120.outbound.protection.outlook.com[40.107.0.120]: 550 5.1.1 <wandira@build-africauganda.org>: Recipient address rejected: User unknown in local recipient table; from=<rnambooze@UAP-GROUP.COM> to=<wandira@build-africauganda.org> proto=ESMTP helo=<EUR02-AM5-obe.outbound.protection.outlook.com>
Mar 29 01:04:40 mail postfix/smtpd[21806]: disconnect from mail-eopbgr00120.outbound.protection.outlook.com[40.107.0.120]

FROM MAIL.ERR

Mar 29 00:34:58 mail postfix/trivial-rewrite[21093]: error: open database /etc/postfix/transport.db: No such file or directory
Mar 29 00:37:26 mail postfix/proxymap[21145]: error: unsupported dictionary type: pgsql
Mar 29 00:37:42 mail postfix/proxymap[21193]: error: unsupported dictionary type: pgsql
Mar 29 00:37:42 mail postfix/proxymap[21193]: error: unsupported dictionary type: pgsql
Mar 29 00:37:42 mail postfix/proxymap[21193]: error: unsupported dictionary type: pgsql
Mar 29 00:37:42 mail postfix/trivial-rewrite[21195]: error: open database /etc/postfix/transport.db: No such file or directory

Well, let's look at the log (note: I've added code tags around the log to inrease readability):
So your server doesn't recognize the recipient address as a valid local (virtual) user (in red), and thus the mail is rejected.

And the reason for this...
...is that the transport database is missing. There may also be other configuration errors related to the PostgreSQL database containing your virtual users.

You could start by running postmap /etc/postfix/transport to rebuild /etc/postfix/transport.db, then restart postfix and look at the logs again.

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