Sender address rejected I am using postfix 2.5.0 and everything seems to be working fine. 
Several errors have arisen lately that I have not been able to correct.

I can't figure out how to parse this error message or correct the 
undeliverable problem:

Feb 13 08:44:40 postfix postfix/smtpd[14716]: NOQUEUE: reject: RCPT from 
parsley.oreillynet.com[208.201.239.25]: 450 4.1.7 
: Sender address rejected: unverified 
address: connect to parsley.oreillynet.com[208.201.239.25]:25: 
Connection refused; from= 
to= proto=ESMTP helo=
Feb 13 08:44:40 postfix postfix/smtpd[14716]: NOQUEUE: reject: RCPT from 
parsley.oreillynet.com[208.201.239.25]: 450 4.1.7 
: Sender address rejected: unverified 
address: connect to parsley.oreillynet.com[208.201.239.25]:25: 
Connection refused; from= 
to= proto=ESMTP helo=

Or this log message, which I understand may be a result of a different 
problem.

Feb 14 13:39:38 postfix postfix/smtpd[29966]: NOQUEUE: reject: RCPT from 
gwa6.webcontrolcenter.com[63.134.207.31]: 550 5.1.7 
: Sender address rejected: undeliverable address: 
host mailb5.webcontrolcenter.com[216.119.115.134] said: 550 Sender is 
not allowed. (in reply to MAIL FROM command); from= 
to= proto=ESMTP helo=

My postconf -n output:

address_verify_map = btree:/var/lib/postfix/address_verify.map
address_verify_negative_cache = yes
address_verify_negative_expire_time = 3d
address_verify_negative_refresh_time = 12h
address_verify_positive_expire_time = 31d
address_verify_positive_refresh_time = 7d
address_verify_sender = postmaster
alias_database = hash:/etc/postfix/aliases
alias_maps = hash:/etc/postfix/aliases
biff = no
body_checks = pcre:/etc/postfix/body_checks.regexp
body_checks_size_limit = 250000
bounce_notice_recipient = rjhqvqc@mandala-designs.com
bounce_size_limit = 10000
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = smtp-amavis:[127.0.0.1]:10024
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
default_destination_concurrency_limit = 100
default_destination_recipient_limit = 50
default_privs = nobody
default_process_limit = 200
delay_notice_recipient = rjhqvqc@mandala-designs.com
delay_warning_time = 4h
disable_vrfy_command = yes
double_bounce_sender = double-bounce
empty_address_recipient = MAILER-DAEMON
error_notice_recipient = rjhqvqc@mandala-designs.com
header_checks = pcre:/etc/postfix/header_checks.regexp
header_size_limit = 256
html_directory = no
ignore_mx_lookup_error = yes
in_flow_delay = 1s
inet_interfaces = all
local_destination_concurrency_limit = 2
local_recipient_maps = 
mail_owner = postfix
mail_spool_directory = /var/spool/mail
mailbox_command = /usr/bin/procmail
mailq_path = /usr/bin/mailq
manpage_directory = /usr/local/man
maximal_backoff_time = 1000s
maximal_queue_lifetime = 5d
message_size_limit = 20000000
mime_header_checks = pcre:/etc/postfix/mime_header_checks.regexp
minimal_backoff_time = 300s
mydestination = $myhostname, localhost.$mydomain, $mydomain, lists.$mydomain, lists.shambhala.com
mydomain = mandala-designs.com
mynetworks = 127.0.0.1, 192.168.1.0/24, xxx.xxx.57.98, xxx.xxx.116.135
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases
owner_request_special = no
queue_directory = /var/spool/postfix
readme_directory = /etc/postfix/readme
recipient_delimiter = +
relay_domains = $mynetworks, shambhala.com, hash:/etc/postfix/transport.map
sample_directory = /etc/postfix
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop
smtp_always_send_ehlo = yes
smtpd_banner = $myhostname - ESMTP - $mail_name - Attn: UCE trespassers will be pursued.
smtpd_hard_error_limit = 20
smtpd_helo_required = yes
smtpd_recipient_restrictions = reject_unauth_pipelining, 
 reject_non_fqdn_sender, 
 reject_non_fqdn_recipient, 
 reject_unverified_recipient, 
 reject_unknown_sender_domain, 
 reject_unverified_sender, 
 permit_mynetworks, 
 check_sender_access hash:/etc/postfix/myspamlist.map, 
 reject_unauth_destination, 
 check_policy_service inet:127.0.0.1:10023, 
 pcre:/etc/postfix/to_recipients_bw.regexp 
 reject_non_fqdn_hostname, 
 reject_rbl_client bl.spamcop.net, 
 reject_rbl_client zen.spamhaus.org, 
 reject_rbl_client sub.mxrate.net=127.0.0.2, 
 reject_rbl_client dul.dnsbl.sorbs.net, 
 reject_rbl_client korea.services.net, 
 reject_rbl_client dnsbl.njabl.org, 
 reject_rbl_client sub.mxrate.net=127.0.0.4, 
 reject_rbl_client list.dsbl.org, 
 reject_rbl_client cbl.abuseat.org, 
 warn_if_reject reject_invalid_hostname, 
 warn_if_reject reject_unknown_hostname, 
 warn_if_reject reject_non_fqdn_hostname, 
 reject_rhsbl_sender bulk.rhs.mailpolice.com,  
 reject_rhsbl_sender porn.rhs.mailpolice.com, 
 permit
strict_rfc821_envelopes = yes
transport_maps = hash:/etc/postfix/transport.map
unknown_address_reject_code = 554
unknown_client_reject_code = 554
unknown_hostname_reject_code = 554
unknown_local_recipient_reject_code = 550

Any advice would be appreciated.
unverified_sender_reject_code = 550



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