On Mon, 28 Jul 2008, Charles Marcus wrote:

Post output of postconf -n

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/postfix/aliases, hash:/etc/postfix/major-aliases
body_checks = regexp:/etc/postfix/body_checks
command_directory = /usr/sbin/
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
debug_peer_list = petfooddirect.com
default_privs = nobody
default_process_limit = 200
header_checks = regexp:/etc/postfix/header_checks
html_directory = no
in_flow_delay = 1s
inet_interfaces = all
local_recipient_maps = unix:passwd.byname $alias_maps
mail_owner = postfix
mail_spool_directory = /var/spool/mail
mailbox_command = /usr/bin/procmail
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
message_size_limit = 32768000
mydestination = $myhostname, mail.$mydomain, localhost.$mydomain,
localhost.$mydomain, $mydomain, /etc/postfix/local/localdomains
mydomain = xxxx.com
myhostname = yyyy.xxxx.com
mynetworks = 192.168.xx.0/24, 127.0.0.0/8
mynetworks_style = subnet
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /etc/postfix/README_FILES
sample_directory = /etc/postfix/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtpd_client_restrictions = check_client_access
hash:/etc/postfix/internal_network,        permit_mynetworks,
check_client_access hash:/etc/postfix/badaddr,        reject_rbl_client
zen.spamhaus.org,        reject_rbl_client bl.spamcop.net,
reject_rbl_client list.dsbl.org,        reject_rhsbl_sender
dsn.rfc-ignorant.org,        reject_unknown_reverse_client_hostname,
check_sender_mx_access cidr:/etc/postfix/bogus_mx,      check_sender_access
hash:/etc/postfix/rhsbl_sender_exceptions,  check_sender_access
hash:/etc/postfix/common_spam_senderdomains,        check_sender_access
hash:/etc/postfix/badaddr,  permit
smtpd_recipient_restrictions = permit_mynetworks,
permit_sasl_authenticated,        reject_unauth_destination,
check_recipient_access hash:/etc/postfix/roleaccount_exceptions,
check_recipient_access hash:/etc/postfix/recipients,
check_helo_access pcre:/etc/postfix/helo_checks,
reject_non_fqdn_recipient,      reject_non_fqdn_sender,
reject_unknown_sender_domain,   reject_non_fqdn_hostname,
reject_invalid_hostname,        permit
smtpd_restriction_classes = has_our_domain_as_sender
smtpd_sasl_auth_enable = yes
smtpd_sasl_path = smtpd
soft_bounce = no
unknown_local_recipient_reject_code = 550

Are you doing SAV (Sender Address Verification)? You should NOT use SAV for general mail reception, you should only do SAV probes for sending domains you control and/or have gotten explicit permission to do SAV for.

  Not sure if that's enabled under a different name.

Disable SAV... you will never be able to receive mail from the big vendors
(gmail, hotmail, yahoo) if you are doing SAV probes all the time...

  I've had no problems -- and still don't -- receiving mail from gmail,
hotmail, or yahoo accounts except for this one instance.

  The sender (@hotmail.com) is using another company's server
(somedomain.com) between her and cox.net. It's that other company's server
to which I cannot trace the route and where dig and whois do not supply the
same IP address and domain name.

Rich

--
Richard B. Shepard, Ph.D.               |  Integrity            Credibility
Applied Ecosystem Services, Inc.        |            Innovation
<http://www.appl-ecosys.com>     Voice: 503-667-4517      Fax: 503-667-8863

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