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    Postfix - antispam and relay package

    Scheduled Pinned Locked Moved pfSense Packages
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    • I
      ics
      last edited by

      Hi,

      My Postfix rejects emails from a server with the error : "Client host rejected: cannot find your hostname"
      However, the IP address is perfectly resolvable.
      And in maillog :
      "warning: ...: hostname domain.net verification failed: hostname nor servname provided, or not known"

      I tried to add the IP address in MyNetworks, no change.

      Do you know what is misconfigured ?

      Thanks

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      • marcellocM
        marcelloc
        last edited by

        The ip address is resolvable, but hostname that server sent on smtp header is?

        Sometimes this wrong hostname is sent on servername or helo info.

        Treinamentos de Elite: http://sys-squad.com

        Help a community developer! ;D

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        • I
          ics
          last edited by

          postfix says :
          RCPT from unknown[IP_Address]: 450 4.7.1 Client host rejected: cannot find your hostname
          The helo is correct and correspond to the IP address when resolved.

          The hostname in smtp header is the HELO ?
          If not where can I find it in the log ?

          Anyway, why is it still rejected while the IP is in MyNetworks ?

          1 Reply Last reply Reply Quote 0
          • marcellocM
            marcelloc
            last edited by

            @ics:

            Anyway, why is it still rejected while the IP is in MyNetworks ?

            even on MyNetworks, the email must be correct.
            The mynetworks will allow this ip to relay to any domain.

            Add this ipname on dns forwarder host override list and check if it pass the resolv test.

            att,
            Marcello Coutinho

            Treinamentos de Elite: http://sys-squad.com

            Help a community developer! ;D

            1 Reply Last reply Reply Quote 0
            • I
              ics
              last edited by

              @marcelloc:

              Add this ipname on dns forwarder host override list and check if it pass the resolv test.

              It works.

              Thank you

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              • A
                arosenau
                last edited by

                Has anyone been able to get this to work using Gmail as a relay? I get the following errors when I try and relay through gmail using this package

                Jul 12 23:50:51
                postfix/smtp[17005]: unable to dlopen /usr/local/lib/sasl2/libgssapiv2.so.2: Shared object "libgssapi.so.10" not found, required by "libgssapiv2.so.2"

                Jul 12 23:50:51
                postfix/smtp[17005]: unable to dlopen /usr/local/lib/sasl2/libgssapiv2.so.2: Shared object "libgssapi.so.10" not found, required by "libgssapiv2.so.2"

                Jul 12 23:50:51
                postfix/smtp[17005]: cannot load Certificate Authority data: disabling TLS support

                Jul 12 23:50:51
                postfix/smtp[17005]: warning: TLS library problem: 17005:error:02001002:system library:fopen:No such file or directory:/usr/src/secure/lib/libcrypto/../../../crypto/openssl/crypto/bio/bss_file.c:126:fopen('/etc/pki/tls/certs/ca-bundle.crt','r'):

                Jul 12 23:50:51
                postfix/smtp[17005]: warning: TLS library problem: 17005:error:2006D080:BIO routines:BIO_new_file:no such file:/usr/src/secure/lib/libcrypto/../../../crypto/openssl/crypto/bio/bss_file.c:129:

                Jul 12 23:50:51
                postfix/smtp[17005]: warning: TLS library problem: 17005:error:0B084002:x509 certificate routines:X509_load_cert_crl_file:system lib:/usr/src/secure/lib/libcrypto/../../../crypto/openssl/crypto/x509/by_file.c:274:

                I think the most important error is this one
                postfix/smtp[17005]: cannot load Certificate Authority data: disabling TLS support

                and I would assume that is because it can't find the smtp_tls_CAfile which I also can't find anywhere on the pfsense box, so I can't specify the correct path in my main.cf file.

                Any ideas? I'm sure its something simple i missed.  :P

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                • marcellocM
                  marcelloc
                  last edited by

                  @arosenau:

                  Any ideas? I'm sure its something simple i missed.  :P

                  you will need some libs from freebsd to get it working.

                  take a look on my repo.
                  i386
                  http://e-sac.siteseguro.ws/pfsense/8/All/ldd/

                  amd64
                  http://e-sac.siteseguro.ws/pfsense/8/amd64/All/ldd/

                  Treinamentos de Elite: http://sys-squad.com

                  Help a community developer! ;D

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                  • A
                    arosenau
                    last edited by

                    @marcelloc:

                    @arosenau:

                    Any ideas? I'm sure its something simple i missed.  :P

                    you will need some libs from freebsd to get it working.

                    take a look on my repo.
                    i386
                    http://e-sac.siteseguro.ws/pfsense/8/All/ldd/

                    amd64
                    http://e-sac.siteseguro.ws/pfsense/8/amd64/All/ldd/

                    Can you point me in the right direction on how to get these installed? I am familiar with apt and yum in the Linux world, but I don't know how package management works in the freebsd/pfsense world.

                    1 Reply Last reply Reply Quote 0
                    • marcellocM
                      marcelloc
                      last edited by

                      @arosenau:

                      Can you point me in the right direction on how to get these installed?

                      Just download the missing libs to /usr/local/lib using fetch cmd on console/ssh and try again.

                      att,
                      Marcello Coutinho

                      Treinamentos de Elite: http://sys-squad.com

                      Help a community developer! ;D

                      1 Reply Last reply Reply Quote 0
                      • A
                        arosenau
                        last edited by

                        @marcelloc:

                        Just download the missing libs to /usr/local/lib using fetch cmd on console/ssh and try again.

                        att,
                        Marcello Coutinho

                        So I got those packages downloaded and stopped and started post fix but I'm still having the same errors. Also I didn't mention in my first post that I also get an error that says " Must issue a STARTTLS command first. y5sm20759670igb.11 (in reply to MAIL FROM command))" I would assume I"m getting this error because it can't load the Certificate Authority data and it disabled TLS support.

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                        • marcellocM
                          marcelloc
                          last edited by

                          @arosenau:

                          Jul 12 23:50:51
                          postfix/smtp[17005]: unable to dlopen /usr/local/lib/sasl2/libgssapiv2.so.2: Shared object "libgssapi.so.10" not found, required by "libgssapiv2.so.2"

                          The postfix message looks for libs on /usr/local/lib/sasl2/ instead of  /usr/local/lib like I've posted.

                          can you try to copy these libs to /usr/local/lib/sasl2/ and teste again?

                          att,
                          Marcello Coutinho

                          Treinamentos de Elite: http://sys-squad.com

                          Help a community developer! ;D

                          1 Reply Last reply Reply Quote 0
                          • A
                            arosenau
                            last edited by

                            @marcelloc:

                            The postfix message looks for libs on /usr/local/lib/sasl2/ instead of  /usr/local/lib like I've posted.

                            can you try to copy these libs to /usr/local/lib/sasl2/ and teste again?

                            att,
                            Marcello Coutinho

                            Still doesn't work, although the error now looks slightly different "unsupported file layout"

                            Jul 16 22:12:40 postfix/smtp[9495]: unable to dlopen /usr/local/lib/sasl2/libgssapiv2.so.2: /usr/local/lib/libgssapi.so.10: unsupported file layout 
Jul 16 22:12:40 postfix/smtp[9495]: unable to dlopen /usr/local/lib/sasl2/libgssapiv2.so.2: /usr/local/lib/libgssapi.so.10: unsupported file layout 
Jul 16 22:12:40 postfix/smtp[9495]: cannot load Certificate Authority data: disabling TLS support 
Jul 16 22:12:40 postfix/smtp[9495]: warning: TLS library problem: 9495:error:02001002:system library:fopen:No such file or directory:/usr/src/secure/lib/libcrypto/../../../crypto/openssl/crypto/bio/bss_file.c:126:fopen('/etc/pki/tls/certs/ca-bundle.crt','r'): 
Jul 16 22:12:40 postfix/smtp[9495]: warning: TLS library problem: 9495:error:2006D080:BIO routines:BIO_new_file:no such file:/usr/src/secure/lib/libcrypto/../../../crypto/openssl/crypto/bio/bss_file.c:129: 
Jul 16 22:12:40 postfix/smtp[9495]: warning: TLS library problem: 9495:error:0B084002:x509 certificate routines:X509_load_cert_crl_file:system lib:/usr/src/secure/lib/libcrypto/../../../crypto/openssl/crypto/x509/by_file.c:274: 
Jul 16 22:12:40 postfix/smtp[9495]: 0EE7440B28F: to=<armyreciepent@gmail.com>, relay=smtp.gmail.com[209.85.225.108]:587, delay=0.64, delays=0.37/0.02/0.21/0.04, dsn=5.7.0, status=bounced (host smtp.gmail.com[209.85.225.108] said: 530 5.7.0 Must issue a STARTTLS command first. ud8sm20864816igb.4 (in reply to MAIL FROM command)) 
Jul 16 22:12:40 postfix/cleanup[9348]: A5BBD40B298: message-id=<20120716221240.A5BBD40B298@relay> 
Jul 16 22:12:40 postfix/bounce[9782]: 0EE7440B28F: sender non-delivery notification: A5BBD40B298 
Jul 16 22:12:40 postfix/qmgr[53688]: A5BBD40B298: from=<>, size=2493, nrcpt=1 (queue active) 
Jul 16 22:12:40 postfix/qmgr[53688]: 0EE7440B28F: removed 
Jul 16 22:12:40 postfix/smtp[9495]: A5BBD40B298: to=<xxx@mydomain.com>, relay=smtp.gmail.com[209.85.225.109]:587, delay=0.16, delays=0.01/0/0.12/0.04, dsn=5.7.0, status=bounced (host smtp.gmail.com[209.85.225.109] said: 530 5.7.0 Must issue a STARTTLS command first. k5sm9875094igq.12 (in reply to MAIL FROM command)) 
Jul 16 22:12:40 postfix/qmgr[53688]: A5BBD40B298: removed</xxx@mydomain.com></armyreciepent@gmail.com>
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                            • marcellocM
                              marcelloc
                              last edited by

                              @arosenau:

                              Still doesn't work, although the error now looks slightly different "unsupported file layout"

                              It normally means you have copied files from a different arch. (i386 files on amd64 for example)

                              Treinamentos de Elite: http://sys-squad.com

                              Help a community developer! ;D

                              1 Reply Last reply Reply Quote 0
                              • A
                                arosenau
                                last edited by

                                @marcelloc:

                                It normally means you have copied files from a different arch. (i386 files on amd64 for example)

                                Yep that was the issue there. I didn't build this box and just assumed it was 64 bit and turns out it is only 32 bit. So that solved those errors although it still doesn't work and I have the below errors, all concerning TLS.

                                Jul 17 00:47:50 postfix/smtp[11692]: cannot load Certificate Authority data: disabling TLS support 
Jul 17 00:47:50 postfix/smtp[11692]: warning: TLS library problem: 11692:error:02001002:system library:fopen:No such file or directory:/usr/src/secure/lib/libcrypto/../../../crypto/openssl/crypto/bio/bss_file.c:126:fopen('/etc/pki/tls/certs/ca-bundle.crt','r'): 
Jul 17 00:47:50 postfix/smtp[11692]: warning: TLS library problem: 11692:error:2006D080:BIO routines:BIO_new_file:no such file:/usr/src/secure/lib/libcrypto/../../../crypto/openssl/crypto/bio/bss_file.c:129: 
Jul 17 00:47:50 postfix/smtp[11692]: warning: TLS library problem: 11692:error:0B084002:x509 certificate routines:X509_load_cert_crl_file:system lib:/usr/src/secure/lib/libcrypto/../../../crypto/openssl/crypto/x509/by_file.c:274: 
Jul 17 00:47:50 postfix/smtp[11692]: DDAE740B293: to=<myrecipient@gmail.com>, relay=smtp.gmail.com[209.85.225.109]:587, delay=0.65, delays=0.37/0.08/0.17/0.04, dsn=5.7.0, status=bounced (host smtp.gmail.com[209.85.225.109] said: 530 5.7.0 Must issue a STARTTLS command first. g5sm10214882ign.4 (in reply to MAIL FROM command)) 
Jul 17 00:47:50 postfix/cleanup[11555]: 841B240B29D: message-id=<20120717004750.841B240B29D@relay> 
Jul 17 00:47:50 postfix/bounce[11894]: DDAE740B293: sender non-delivery notification: 841B240B29D 
Jul 17 00:47:50 postfix/qmgr[56809]: 841B240B29D: from=<>, size=2491, nrcpt=1 (queue active) 
Jul 17 00:47:50 postfix/qmgr[56809]: DDAE740B293: removed 
Jul 17 00:47:50 postfix/smtp[11692]: 841B240B29D: to=<myuser@mydomain.com>, relay=smtp.gmail.com[209.85.225.108]:587, delay=0.17, delays=0.01/0/0.12/0.04, dsn=5.7.0, status=bounced (host smtp.gmail.com[209.85.225.108] said: 530 5.7.0 Must issue a STARTTLS command first. pp4sm21477529igb.5 (in reply to MAIL FROM command)) 
Jul 17 00:47:50 postfix/qmgr[56809]: 841B240B29D: removed</myuser@mydomain.com></myrecipient@gmail.com>
                                1 Reply Last reply Reply Quote 0
                                • A
                                  arosenau
                                  last edited by

                                  So I ended up solving the TLS errors by downloading the following cert bundle. Is this the correct bundle? It is working now but is this the long term solution?

                                  http://curl.haxx.se/ca/cacert.pem

                                  1 Reply Last reply Reply Quote 0
                                  • marcellocM
                                    marcelloc
                                    last edited by

                                    I think this TLS ca missing cert is from remote site certificate.

                                    the ca_root certificate package on freebsd ports is ca_root_nss-3.13.5

                                    Mailscanner package installs it, but the way you did(if you trust http://curl.haxx.se site) also installed the ca bundle certs file.

                                    schedule from time to time an ca_bundle file update.

                                    Treinamentos de Elite: http://sys-squad.com

                                    Help a community developer! ;D

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                                    • U
                                      Unubtanium
                                      last edited by

                                      So if i am not way leftfield, would i go about stopping backscatter coming in with something like this:
                                      OR have i blown a logic fuse  :P

                                      By put this in header check under ACL

                                      /^(From|Return-Path):.*\b(user@domain.tld)\b/
                                             reject forged sender address in $1: header: $2

                                      And putting this in body checks

                                      /^[> ](From|Return-Path):.\b(user@domain.tld)\b/
                                             reject forged sender address in $1: header: $2

                                      I am a bit confused after reading this: http://www.postfix.org/BACKSCATTER_README.html
                                      DO i have to manually have to change the user@domain to my local domain users so it would be user@mydomain.com and or will
                                      it check my Valid recipients and block ALL external emails that comes from the internet with my Valid recipients as from field?
                                      ???

                                      And would this also help stopping me from being a source for backscatter? or again have i blown a fuse??

                                      1 Reply Last reply Reply Quote 0
                                      • marcellocM
                                        marcelloc
                                        last edited by

                                        @Unubtanium:

                                        I am a bit confused after reading this: http://www.postfix.org/BACKSCATTER_README.html
                                        DO i have to manually have to change the user@domain to my local domain users so it would be user@mydomain.com and or will
                                        it check my Valid recipients and block ALL external emails that comes from the internet with my Valid recipients as from field?
                                        ???

                                        All postfix antispam settings(spf checks, helo checks, etc..) and valid recipients can do a really good job on rejecting junk/misconfigured mail servers.
                                        If you want to apply these backscatter rules, you need to change user@domain to your domain.

                                        @Unubtanium:

                                        And would this also help stopping me from being a source for backscatter? or again have i blown a fuse??

                                        Do you have any postfix log with these backscatter on your domain?

                                        att,
                                        Marcello Coutinho

                                        Treinamentos de Elite: http://sys-squad.com

                                        Help a community developer! ;D

                                        1 Reply Last reply Reply Quote 0
                                        • U
                                          Unubtanium
                                          last edited by

                                          @marcelloc:

                                          Do you have any postfix log with these backscatter on your domain?

                                          att,
                                          Marcello Coutinho

                                          No i do not, it is just me being very worried about it and want to take any steps to stop it.

                                          So i guess it is all smooth sailing for now.
                                          Just need to figure this one out:

                                          07-26-2012 15:40:28 Mail.Info lanip Jul 26 15:42:50 postfix/postscreen[13438]: DISCONNECT [49.236.198.230]:64766
                                          07-26-2012 15:40:28 Mail.Info lanip Jul 26 15:42:50 postfix/postscreen[13438]: HANGUP after 1.1 from [49.236.198.230]:64766 in tests after SMTP handshake
                                          07-26-2012 15:40:27 Mail.Info lanip Jul 26 15:42:49 postfix/postscreen[13438]: CONNECT from [49.236.198.230]:64766
                                          07-26-2012 15:40:27 Local0.Info lanip Jul 26 15:42:49 pf:     49.236.198.230.64766 > wanip.25: Flags [ S ], cksum 0xa6f8 (correct), seq 652894980, win 8192, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0

                                          And then finaly i can enjoy the Olympic :)

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                                          • Z
                                            zlyzwy
                                            last edited by

                                            Hi Marcelloc,

                                            I got these error message from maillog:

                                            Jul 27 14:40:59 pfsense MailScanner[9782]: You want to use SpamAssassin but have not installed it.
                                            Jul 27 14:40:59 pfsense MailScanner[9782]: Please download http://www.sng.ecs.soton.ac.uk/mailscanner/files/4/install-Clam-SA.tar.gz and unpack it and run ./install.sh to install it, then restart MailScanner.
                                            Jul 27 14:40:59 pfsense MailScanner[9782]: I will run without SpamAssassin for now, you will not detect much spam until you install SpamAssassin.

                                            All the email has been hold by postfix…
                                            Do you know any reason why this will happen?
                                            Thanks~

                                            Zlyzwy

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