Hi there,
Yahoo starts blocking e-mails from our server.
It is possible that someone/somehow is sending spams.
Please help me find what is sending spam from our server.
First please explain to me the following logs (ourdomain is hosted on our server):
Code:
Feb 3 14:45:57 softexp postfix/smtpd[23394]: NOQUEUE: reject: RCPT from unknown[117.87.x.x]: 554 5.7.1 Service unavailable; Client host [117.87.x.x] blocked using sbl-xbl.spamhaus.org; http://www.spamhaus.org/query/bl?ip=117.87.x.x; from=<xyz@yahoo.com.au> to=<experienceoffice@ourdomain.ro> proto=ESMTP helo=<PC-200901111752>
Feb 3 14:45:58 softexp postfix/smtp[23424]: 56966AC86D: to=<xyz@yahoo.com.au>, relay=d.mx.mail.yahoo.com[66.196.82.7]:25, delay=7.6, delays=0/0.01/7.6/0, dsn=4.7.0, status=undeliverable (host d.mx.mail.yahoo.com[66.196.82.7] refused to talk to me: 421 4.7.0 [TS02] Messages from 80.96.148.194 temporarily deferred due to user complaints - 4.16.56.1; see http://postmaster.yahoo.com/421-ts02.html)
What I understand:
1. the client 117.87.x.x tries to connect to our server but is blocked. (it is at spamhouse). It tries to send frm
xyz@yahoo.com to
experienceoffie@ourdomain.com.
Everything ok till now.
2. what does the second line means? Our server is tring to send to
xyz@yahoo.com. Why? It is for sure related with the first log line...
It is because of some bounce message or what?
Thank you
my postfix restrictions are:
Code:
smtpd_helo_restrictions =
reject_invalid_hostname
smtpd_sender_restrictions =
reject_unknown_sender_domain,
reject_non_fqdn_sender,
# warn_if_reject reject_unverified_sender
reject_unverified_sender,
permit
smtpd_recipient_restrictions =
# permit_mynetworks
permit_sasl_authenticated
reject_unauth_destination
# check_sender_access hash:/usr/local/etc/postfix/access_sender
check_helo_access pcre:/usr/local/etc/postfix/helo_checks
reject_non_fqdn_recipient
reject_unknown_recipient_domain
reject_unverified_recipient
reject_rbl_client list.dsbl.org,
reject_rbl_client sbl-xbl.spamhaus.org,
reject_rhsbl_sender dsn.rfc-ignorant.org
permit