Please Help My Server keep try to sending spam

Hi
i saw there is a lot of usage in smtp and after my investigation i use command 'mailq' i saw a lot of email queue from my server
one of the Example of the mailq list :

B602841969    14002 Wed Feb 15 09:27:35  agus@srv2.pusatwebhosting.com
(host mta5.am0.yahoodns.net[98.136.217.203] said: 421 4.7.0 [TSS04] Messages from 45.55.54.241 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html (in reply to MAIL FROM command))
                                         samanthadegraaff@rocketmail.com


agus@srv2.pusatwebhosting.com
srv2.pusatwebhosting.com is my server name. and agus is one of my user account.
it surely failed since it keep trying using user@hostname how to fixed this issue? it keep growing and growing and all i can do is manually delete all the queue email.
kindly help

here is my setting in /etc/postfix/main.cf
=====================
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
anvil_rate_time_unit = 3600s
broken_sasl_auth_clients = yes
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
debug_peer_level = 2
delay_warning_time = 4
disable_vrfy_command = yes
html_directory = no
inet_interfaces = all
mail_owner = postfix
mailbox_size_limit = 2048000000
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
message_size_limit = 204800000
milter_default_action = accept
milter_protocol = 2
mydestination = $myhostname, localhost.$mydomain, localhost
mydomain = pusatwebhosting.com
myhostname = srv2.pusatwebhosting.com
mynetworks = $config_directory/mynetworks
newaliases_path = /usr/bin/newaliases.postfix
non_smtpd_milters = $smtpd_milters
queue_directory = /var/spool/postfix
recipient_bcc_maps = proxy:mysql:/etc/postfix/mysql-virtual_vacation.cf
recipient_delimiter = +
relay_domains = proxy:mysql:/etc/postfix/mysql-relay_domains_maps.cf
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtp_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt
smtp_tls_session_cache_database = btree:$data_directory/smtp_tls_session_cache
smtp_use_tls = yes
smtpd_client_message_rate_limit = 500
smtpd_client_restrictions = reject_unknown_client
smtpd_data_restrictions = reject_unauth_pipelining
smtpd_helo_required = yes
smtpd_helo_restrictions =
smtpd_milters = inet:127.0.0.1:8891
smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, check_client_access hash:/etc/postfix/sender_whitelist, check_client_access hash:/etc/postfix/sender_blacklist, reject_unauth_destination, reject_non_fqdn_sender, reject_non_fqdn_recipient, reject_unknown_recipient_domain, reject_rbl_client zen.spamhaus.org, reject_rbl_client bl.spamcop.net,check_policy_service unix:private/spfpolicy
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_path = private/auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_sender_restrictions =
smtpd_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt
smtpd_tls_cert_file = /etc/pki/tls/certs/srv2.pusatwebhosting.com.crt
smtpd_tls_key_file = /etc/pki/tls/private/srv2.pusatwebhosting.com.key
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_security_level = may
smtpd_tls_session_cache_timeout = 3600s
smtpd_use_tls = yes
soft_bounce = yes
tls_random_source = dev:/dev/urandom
transport_maps = hash:/etc/postfix/transport
unknown_local_recipient_reject_code = 550
virtual_alias_maps = proxy:mysql:/etc/postfix/mysql-virtual_alias_maps.cf, regexp:/etc/postfix/virtual_regexp
virtual_gid_maps = static:12
virtual_mailbox_base = /var/vmail
virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains_maps.cf
virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailbox_maps.cf
virtual_minimum_uid = 101
virtual_transport = dovecot
virtual_uid_maps = static:101
==========================


thanks and appreciated.
Agus

Bang bisa bantuin ane?  Gimana caranya setting smtp?  Ane baru aja install CWP tapi gak tau cara buat smtpnya ane mau send pake ultra mailer

Remove soft_bounce = yes from your /etc/postfix/main.cf to fix the "forever resending" issue.