[lug] Am I spamming? postfix log question

[Chip Atkinson]

Hi folks,

I'm going through my maillogs and I see entries like this:

maillog-20140811:Aug  5 00:03:46 tedward postfix/cleanup[23181]: 
B64A11AE3AB2: message-id=<20140805060346.B64A11AE3AB2 at tedward.pupman.com>

maillog-20140811:Aug  5 00:03:46 tedward postfix/qmgr[6868]: B64A11AE3AB2: 
from=<>, size=10913, nrcpt=1 (queue active)

maillog-20140811:Aug  5 00:03:46 tedward postfix/bounce[23183]: 
84C3A1AE3AA9: sender non-delivery notification: B64A11AE3AB2

maillog-20140811:Aug  5 00:03:46 tedward postfix/smtp[23187]: 
B64A11AE3AB2: to=<BureauScores at natric.eu>, 
relay=hgsp68.natric.eu[162.253.152.22]:25, delay=0.24, 
delays=0/0.01/0.23/0, dsn=4.4.2, status=deferred (lost connection with 
hgsp68.natric.eu[162.253.152.22] while receiving the initial server 
greeting)

maillog-20140811:Aug  5 00:12:38 tedward postfix/qmgr[6868]: B64A11AE3AB2: 
from=<>, size=10913, nrcpt=1 (queue active)

maillog-20140811:Aug  5 00:12:38 tedward postfix/smtp[1505]: B64A11AE3AB2: 
to=<BureauScores at natric.eu>, relay=hgsp68.natric.eu[162.253.152.22]:25, 
delay=532, delays=532/0.01/0.19/0, dsn=4.4.2, status=deferred (lost 
connection with hgsp68.natric.eu[162.253.152.22] while receiving the 
initial server greeting)

(Gaps added for clarity due to wrapping)

To me it looks like my server got some email from "<>" and then tried to 
deliver to BureauScores at natric.edu.

Is my interpretation correct, and if so, any suggestions on how to combat 
the problem?

Here's postconf -n's output if that helps.

Thanks in advance.

Chip


alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases, hash:/usr/local/mailman/data/aliases
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 = 167.88.120.115
html_directory = no
in_flow_delay = 1s
inet_interfaces = all
inet_protocols = ipv4
local_recipient_maps =
mail_owner = postfix
mail_spool_directory = /var/spool/mail
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
masquerade_domains = pupman.com
message_size_limit = 20480000
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain, 
mail.$mydomain, www.$mydomain, chip1.$mydomain,  tedward.pupman.com, 
www.pupman.com
mydomain = pupman.com
myhostname = tedward.pupman.com
mynetworks = 127.0.0.0/8, 167.88.120.115 [::1]/128
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases.postfix
owner_request_special = no
proxy_interfaces = 167.88.120.115
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES
recipient_delimiter = +
relay_domains = $mydestination, pupman.com,
sample_directory = /usr/share/doc/postfix-2.6.6/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtpd_client_restrictions = permit_mynetworks
smtpd_data_restrictions = permit_mynetworks, reject_unauth_pipelining, 
reject_unauth_destination
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks,    reject_non_fqdn_hostname, 
reject_invalid_hostname,    permit
smtpd_recipient_restrictions = permit_mynetworks, 
permit_sasl_authenticated,           reject_non_fqdn_sender, 
reject_non_fqdn_recipient,           reject_non_fqdn_hostname, 
reject_invalid_hostname,           reject_unauth_pipelining, 
reject_unauth_destination,	   check_client_access 
hash:/etc/postfix/rbl_override,           reject_unknown_sender_domain, 
reject_unknown_recipient_domain,           reject_rbl_client 
zen.spamhaus.org,           reject_rbl_client dnsbl.njabl.net, 
reject_rbl_client bl.spamcop.net,           reject_rbl_client 
cbl.abuseat.org,           reject_rhsbl_helo dbl.spamhaus.org, 
reject_rhsbl_sender dbl.spamhaus.org,           permit
smtpd_sender_restrictions = permit_mynetworks, 
reject_unknown_sender_domain, 
reject_unknown_address
unknown_local_recipient_reject_code = 550