Hello,
I am trying to solve this mystery and I am not sure which setting to look for. I don't have any issues sending or receving emails from my server (Centos 6.4 / Virtualmin all up to date). The problem is that I am not receiving an error back when for example an email gets rejected for whatever reason from the other end (ANY server). I have also enabled the "Request Delivery Receipt" in Outlook but I am not getting any errors (or any receipt anyway) when I deliberately send emails to unknown users of an existing domain. Sending the same emails from my Gmail works ok with the usual reports. Why I am not getting those when I am using my server?
Any ideas?
Note that I AM getting errors back if I send an email to an unknown host.
First step here is, like always and with any Linux problem, to take a look at the logfiles in /var/log. The process of returning an undeliverable mail should be noted there, also any problems that occur during that.
I am sorry for omitting the obvious but I have done this already and I couldn't spot the error: Here is an extract of maillog during an attempt to send an email from mynormal user to a NOT-existing email account (of a real domain, hosted elsewhere).
I have made some substitutions of real data.
Nov 30 13:48:00 myserver-hostname postfix/smtpd[26992]: connect from []
Nov 30 13:48:00 myserver-hostname postfix/smtpd[26992]: setting up TLS connection from []
Nov 30 13:48:00 myserver-hostname postfix/smtpd[26992]: Anonymous TLS connection established from []: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
Nov 30 13:48:01 myserver-hostname postfix/smtpd[26992]: NOQUEUE: reject: RCPT from []: 550 5.1.1 NOT-existing-mailbox@an-existing-domain.net: Recipient address rejected: User unknown in virtual alias table; from=my-existing-user@mydomain.com to=NOT-existing-mailbox@an-existing-domain.net proto=ESMTP helo=
Nov 30 13:48:04 myserver-hostname postfix/smtpd[26992]: disconnect from []
That's all.
EDIT:
smtpd_sender_restrictions = warn_if_reject reject_unknown_sender_domain reject_non_fqdn_sender
smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination reject_rbl_client zen.spamhaus.org reject_rbl_client bl.spamcop.net check_policy_service unix:/var/spool/postfix/postgrey/socket
Are those correct?
Anyone's input please?
I have no immediate idea what could be wrong for you, but here's the log transcript of a "correct" NDR:
Thank you for the reply. Although I tried I cant figure out which configuration setting is the one to be blamed.
Could you please share at least your 2 postix config files? That I think will spread some light to the problem.
Much appreciated if you can do that. N
Sure, here you are. main.cf:
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no append_dot_mydomain = no delay_warning_time = 4h readme_directory = no # TLS parameters smtpd_tls_cert_file = /etc/postfix/sslmail_tianet_de.crt smtpd_tls_key_file = /etc/postfix/sslmail_tianet_de.key smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. myhostname = hostname.domain.de alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = hostname.domain.de, localhost.domain.de, , localhost mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mailbox_command = /usr/bin/procmail-wrapper -o -a $DOMAIN -a "$EXTENSION" -d $LOGNAME mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all virtual_alias_maps = hash:/etc/postfix/virtual sender_bcc_maps = hash:/etc/postfix/bcc home_mailbox = Maildir/ smtpd_sasl_auth_enable = yes broken_sasl_auth_clients = yes smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination permit_dnswl_client list.dnswl.org check_policy_service inet:127.0.0.1:10023 allow_percent_hack = no smtpd_client_restrictions = permit_sasl_authenticated permit_dnswl_client list.dnswl.org reject_rbl_client zen.spamhaus.org check_client_access hash:/etc/postfix/client-reject message_size_limit = 50000000 smtpd_tls_CAfile = /etc/postfix/startcom.pem smtpd_sasl_authenticated_header = yes maximal_queue_lifetime = 3d bounce_queue_lifetime = 3d smtpd_client_connection_rate_limit = 15 smtpd_client_message_rate_limit = 25 smtpd_client_recipient_rate_limit = 50master.cf:
# # Postfix master process configuration file. For details on the format # of the file, see the master(5) manual page (command: "man 5 master"). # # Do not forget to execute "postfix reload" after editing this file. # # ========================================================================== # service type private unpriv chroot wakeup maxproc command + args # (yes) (yes) (yes) (never) (100) # ========================================================================== smtp inet n - - - - smtpd -o smtpd_sasl_auth_enable=yes #smtp inet n - - - 1 postscreen #smtpd pass - - - - - smtpd #dnsblog unix - - - - 0 dnsblog #tlsproxy unix - - - - 0 tlsproxy #submission inet n - - - - smtpd # -o syslog_name=postfix/submission # -o smtpd_tls_security_level=encrypt # -o smtpd_sasl_auth_enable=yes # -o smtpd_client_restrictions=permit_sasl_authenticated,reject # -o milter_macro_daemon_name=ORIGINATING smtps inet n - - - - smtpd -o syslog_name=postfix/smtps -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes -o smtpd_client_restrictions=permit_sasl_authenticated,reject -o milter_macro_daemon_name=ORIGINATING #628 inet n - - - - qmqpd pickup fifo n - - 60 1 pickup cleanup unix n - - - 0 cleanup qmgr fifo n - n 300 1 qmgr #qmgr fifo n - n 300 1 oqmgr tlsmgr unix - - - 1000? 1 tlsmgr rewrite unix - - - - - trivial-rewrite bounce unix - - - - 0 bounce defer unix - - - - 0 bounce trace unix - - - - 0 bounce verify unix - - - - 1 verify flush unix n - - 1000? 0 flush proxymap unix - - n - - proxymap proxywrite unix - - n - 1 proxymap smtp unix - - - - - smtp relay unix - - - - - smtp # -o smtp_helo_timeout=5 -o smtp_connect_timeout=5 showq unix n - - - - showq error unix - - - - - error retry unix - - - - - error discard unix - - - - - discard local unix - n n - - local virtual unix - n n - - virtual lmtp unix - - - - - lmtp anvil unix - - - - 1 anvil scache unix - - - - 1 scache # # ==================================================================== # Interfaces to non-Postfix software. Be sure to examine the manual # pages of the non-Postfix software to find out what options it wants. # # Many of the following services use the Postfix pipe(8) delivery # agent. See the pipe(8) man page for information about ${recipient} # and other message envelope options. # ==================================================================== # # maildrop. See the Postfix MAILDROP_README file for details. # Also specify in main.cf: maildrop_destination_recipient_limit=1 # maildrop unix - n n - - pipe flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient} # # ==================================================================== # # Recent Cyrus versions can use the existing "lmtp" master.cf entry. # # Specify in cyrus.conf: # lmtp cmd="lmtpd -a" listen="localhost:lmtp" proto=tcp4 # # Specify in main.cf one or more of the following: # mailbox_transport = lmtp:inet:localhost # virtual_transport = lmtp:inet:localhost # # ==================================================================== # # Cyrus 2.1.5 (Amos Gouaux) # Also specify in main.cf: cyrus_destination_recipient_limit=1 # #cyrus unix - n n - - pipe # user=cyrus argv=/cyrus/bin/deliver -e -r ${sender} -m ${extension} ${user} # # ==================================================================== # Old example of delivery via Cyrus. # #old-cyrus unix - n n - - pipe # flags=R user=cyrus argv=/cyrus/bin/deliver -e -m ${extension} ${user} # # ==================================================================== # # See the Postfix UUCP_README file for configuration details. # uucp unix - n n - - pipe flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient) # # Other external delivery methods. # ifmail unix - n n - - pipe flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient) bsmtp unix - n n - - pipe flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient scalemail-backend unix - n n - 2 pipe flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension} mailman unix - n n - - pipe flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py ${nexthop} ${user} submission inet n - - - - smtpd -o smtpd_sasl_auth_enable=yesHmm, I've never heard of what you're describing before... in theory, an email response is just being sent to the sender, if the address doesn't exist.
And in your email logs that you shared above, I don't see any problems, though I do see an email being delivered to an account on your server.
Is it possible that the messages are ending up in a spam folder?
Also, could you post the output of "postconf -n"?
That will show just the non-default Postfix options, which hopefully will make it simpler to see if there are any problems.
-Eric
Thank you for the reply.
I am attaching the postconf result on a txt file because copy pasting it in here does not recognize break-lines and all the text shows as one line.
andreychek, do you see any problems with the posted config?
N
To paste shell listings directly in a post here, you can enclose it in
[code][/code] tags, that will preserve linebreaks and monospace font.What about now?
Well, I don't see anything that jumps out at me which would explain the behavior you're seeing.
I didn't see any issues in the blurb from your logs though, is it possible that the missing emails are in an alternate folder, such as a spam folder?
-Eric
Well that was my No1 troubleshooting method. To look there. But no. Nothing. :(