ZhangHuangbin wrote:1) Does this user use a weak password?
2) Can you find any related log of sent spam from this user in Postfix log file?
3) Show us output of command "postconf -n" to help troubleshoot please.
1. I don't think he is using a weak password. When we migrated the email, the password plugin from roundcube asks for a combination of letters and numbers with at least 8 chars (if i remember it).
I already asks him to change his password.
2. some logs i have found to a particular email.
Mar 13 21:04:40 mail postfix/smtp[13069]: E94AA81139: to=<melly1302@gmail.com>, relay=alt1.gmail-smtp-in.l.google.com[74.125.193.26]:25, delay=80333, delays=80318/0/6.4/9, dsn=4.7.0, status=deferred (host alt1.gmail-smtp-in.l.google.com[74.125.193.26] said: 421-4.7.0 [202.60.9.16 15] Our system has detected an unusual rate of 421-4.7.0 unsolicited mail originating from your IP address. To protect our 421-4.7.0 users from spam, mail sent from your IP address has been temporarily 421-4.7.0 rate limited. Please visit http://www.google.com/mail/help/bulk_mail. 421 4.7.0 html to review our Bulk Email Senders Guidelines. j9si65452igv.0 - gsmtp (in reply to end of DATA command))
Mar 13 22:14:24 mail postfix/qmgr[30989]: E94AA81139: from=<user@mydomain.com.ph>, size=1757, nrcpt=1 (queue active)
Mar 13 22:14:27 mail postfix/smtp[16873]: E94AA81139: host gmail-smtp-in.l.google.com[74.125.25.27] said: 421-4.7.0 [202.60.9.16 15] Our system has detected an unusual rate of 421-4.7.0 unsolicited mail originating from your IP address. To protect our 421-4.7.0 users from spam, mail sent from your IP address has been temporarily 421-4.7.0 rate limited. Please visit http://www.google.com/mail/help/bulk_mail. 421 4.7.0 html to review our Bulk Email Senders Guidelines. tu7si1521226pac.388 - gsmtp (in reply to end of DATA command)
Mar 13 22:14:29 mail postfix/smtp[16873]: E94AA81139: to=<melly1302@gmail.com>, relay=alt1.gmail-smtp-in.l.google.com[74.125.193.27]:25, delay=84523, delays=84518/0.02/3.4/1.5, dsn=4.7.0, status=deferred (host alt1.gmail-smtp-in.l.google.com[74.125.193.27] said: 421-4.7.0 [202.60.9.16 15] Our system has detected an unusual rate of 421-4.7.0 unsolicited mail originating from your IP address. To protect our 421-4.7.0 users from spam, mail sent from your IP address has been temporarily 421-4.7.0 rate limited. Please visit http://www.google.com/mail/help/bulk_mail. 421 4.7.0 html to review our Bulk Email Senders Guidelines. y8si3703073icp.17 - gsmtp (in reply to end of DATA command))
Mar 13 23:24:24 mail postfix/qmgr[30989]: E94AA81139: from=<user@mydomain.com.ph>, size=1757, nrcpt=1 (queue active)
Mar 13 23:24:26 mail postfix/smtp[20127]: E94AA81139: host gmail-smtp-in.l.google.com[74.125.25.26] said: 421-4.7.0 [202.60.9.16 15] Our system has detected an unusual rate of 421-4.7.0 unsolicited mail originating from your IP address. To protect our 421-4.7.0 users from spam, mail sent from your IP address has been temporarily 421-4.7.0 rate limited. Please visit http://www.google.com/mail/help/bulk_mail. 421 4.7.0 html to review our Bulk Email Senders Guidelines. a3si1657170pay.430 - gsmtp (in reply to end of DATA command)
Mar 13 23:24:31 mail postfix/smtp[20127]: E94AA81139: to=<melly1302@gmail.com>, relay=alt1.gmail-smtp-in.l.google.com[74.125.193.26]:25, delay=88724, delays=88718/0.02/3.4/2.9, dsn=4.7.0, status=deferred (host alt1.gmail-smtp-in.l.google.com[74.125.193.26] said: 421-4.7.0 [202.60.9.16 15] Our system has detected an unusual rate of 421-4.7.0 unsolicited mail originating from your IP address. To protect our 421-4.7.0 users from spam, mail sent from your IP address has been temporarily 421-4.7.0 rate limited. Please visit http://www.google.com/mail/help/bulk_mail. 421 4.7.0 html to review our Bulk Email Senders Guidelines. qm1si2612565igc.36 - gsmtp (in reply to end of DATA command))
Mar 13 23:24:31 mail postfix/qmgr[30989]: E94AA81139: from=<user@mydomain.com.ph>, status=expired, returned to sender
Mar 13 23:24:31 mail postfix/bounce[20253]: E94AA81139: sender non-delivery notification: 1DD58810D8
Mar 13 23:24:31 mail postfix/qmgr[30989]: E94AA81139: removed
root@mail:/var/log# cat mail.log | grep "Mar 13 23:24:31"
Mar 13 23:24:31 mail postfix/smtp[20127]: E94AA81139: to=<melly1302@gmail.com>, relay=alt1.gmail-smtp-in.l.google.com[74.125.193.26]:25, delay=88724, delays=88718/0.02/3.4/2.9, dsn=4.7.0, status=deferred (host alt1.gmail-smtp-in.l.google.com[74.125.193.26] said: 421-4.7.0 [202.60.9.16 15] Our system has detected an unusual rate of 421-4.7.0 unsolicited mail originating from your IP address. To protect our 421-4.7.0 users from spam, mail sent from your IP address has been temporarily 421-4.7.0 rate limited. Please visit http://www.google.com/mail/help/bulk_mail. 421 4.7.0 html to review our Bulk Email Senders Guidelines. qm1si2612565igc.36 - gsmtp (in reply to end of DATA command))
Mar 13 23:24:31 mail postfix/qmgr[30989]: E94AA81139: from=<user@mydomain.com.ph>, status=expired, returned to sender
Mar 13 23:24:31 mail postfix/cleanup[19605]: 1DD58810D8: message-id=<20140313152431.1DD58810D8@mail.mydomain.ph>
Mar 13 23:24:31 mail postfix/bounce[20253]: E94AA81139: sender non-delivery notification: 1DD58810D8
Mar 13 23:24:31 mail postfix/qmgr[30989]: 1DD58810D8: from=<>, size=4517, nrcpt=1 (queue active)
Mar 13 23:24:31 mail postfix/qmgr[30989]: E94AA81139: removed
Mar 13 23:24:31 mail postfix/pipe[20216]: 1DD58810D8: to=<user@mydomain.com.ph>, relay=dovecot, delay=0.28, delays=0.07/0/0/0.2, dsn=2.0.0, status=sent (delivered via dovecot service)
Mar 13 23:24:31 mail postfix/qmgr[30989]: 1DD58810D8: removed
3. postconf -n
alias_database = hash:/etc/postfix/aliases
alias_maps = hash:/etc/postfix/aliases
allow_min_user = no
allow_percent_hack = no
append_dot_mydomain = no
biff = no
bounce_queue_lifetime = 4h
broken_sasl_auth_clients = yes
config_directory = /etc/postfix
content_filter = smtp-amavis:[127.0.0.1]:10024
delay_warning_time = 0h
disable_vrfy_command = yes
dovecot_destination_recipient_limit = 1
enable_original_recipient = no
home_mailbox = Maildir/
inet_interfaces = all
inet_protocols = ipv4
mailbox_command = /usr/lib/dovecot/deliver
mailbox_size_limit = 0
maximal_backoff_time = 4000s
maximal_queue_lifetime = 24h
message_size_limit = 125829120
minimal_backoff_time = 300s
mydestination = $myhostname, localhost, localhost.localdomain, localhost.$myhostname
mydomain = mydomain.ph
myhostname = mail.mydomain.ph
mynetworks = 127.0.0.0/8 [our public ip block is here] [ip block of our internal lan]
mynetworks_style = subnet
myorigin = mail.mydomain.ph
proxy_read_maps = $canonical_maps $lmtp_generic_maps $local_recipient_maps $mydestination $mynetworks $recipient_bcc_maps $recipient_canonical_maps $relay_domains $relay_recipient_maps $relocated_maps $sender_bcc_maps $sender_canonical_maps $smtp_generic_maps $smtpd_sender_login_maps $transport_maps $virtual_alias_domains $virtual_alias_maps $virtual_mailbox_domains $virtual_mailbox_maps $smtpd_sender_restrictions
queue_run_delay = 300s
readme_directory = no
recipient_bcc_maps = proxy:mysql:/etc/postfix/mysql/recipient_bcc_maps_user.cf, proxy:mysql:/etc/postfix/mysql/recipient_bcc_maps_domain.cf
recipient_delimiter = +
relay_domains = $mydestination, proxy:mysql:/etc/postfix/mysql/relay_domains.cf
relayhost =
sender_bcc_maps = proxy:mysql:/etc/postfix/mysql/sender_bcc_maps_user.cf, proxy:mysql:/etc/postfix/mysql/sender_bcc_maps_domain.cf
smtp-amavis_destination_recipient_limit = 1
smtp_data_init_timeout = 240s
smtp_data_xfer_timeout = 600s
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
smtpd_data_restrictions = reject_unauth_pipelining
smtpd_end_of_data_restrictions = check_policy_service inet:127.0.0.1:10031
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_helo_hostname, reject_invalid_helo_hostname, check_helo_access pcre:/etc/postfix/helo_access.pcre
smtpd_recipient_restrictions = permit_mynetworks, reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_non_fqdn_sender, reject_non_fqdn_recipient, reject_unlisted_recipient, check_policy_service inet:127.0.0.1:7777, check_policy_service inet:127.0.0.1:10031, permit_sasl_authenticated, reject_unauth_destination
smtpd_reject_unlisted_recipient = yes
smtpd_reject_unlisted_sender = yes
smtpd_sasl_auth_enable = yes
smtpd_sasl_authenticated_header = no
smtpd_sasl_local_domain =
smtpd_sasl_path = ./dovecot-auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_sender_login_maps = proxy:mysql:/etc/postfix/mysql/sender_login_maps.cf
smtpd_sender_restrictions = permit_mynetworks, reject_sender_login_mismatch, permit_sasl_authenticated
smtpd_tls_CAfile = /etc/ssl/certs/iRedMail_CA.pem
smtpd_tls_cert_file = /etc/ssl/certs/iRedMail_CA.pem
smtpd_tls_key_file = /etc/ssl/private/iRedMail.key
smtpd_tls_loglevel = 0
smtpd_tls_security_level = may
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes
swap_bangpath = no
tls_random_source = dev:/dev/urandom
transport_maps = proxy:mysql:/etc/postfix/mysql/transport_maps_user.cf, proxy:mysql:/etc/postfix/mysql/transport_maps_domain.cf
virtual_alias_domains =
virtual_alias_maps = proxy:mysql:/etc/postfix/mysql/virtual_alias_maps.cf, proxy:mysql:/etc/postfix/mysql/domain_alias_maps.cf, proxy:mysql:/etc/postfix/mysql/catchall_maps.cf, proxy:mysql:/etc/postfix/mysql/domain_alias_catchall_maps.cf
virtual_gid_maps = static:2000
virtual_mailbox_base = /var/vmail/mailbox
virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql/virtual_mailbox_domains.cf
virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql/virtual_mailbox_maps.cf
virtual_minimum_uid = 2000
virtual_transport = dovecot
virtual_uid_maps = static:2000
So I guess one of my users is sending spam email. Or it could be someone is using his identity to send emails.
How do I trouble shoot this? My client is an important person.
