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Thread: Not able to send mails between one machine to another

  1. #1
    fizeeosuse NNTP User

    Default Not able to send mails between one machine to another

    Hi all,

    I have configured Post fix installation for a local dns server(with domain name as dns.internal) in OPEN SUSE 11.1 .I have set the dns A ,NS, MX record accordingly.Since i am learning i have used the same server for both dns as well as mail server and IP of the machine is 192.168.1.20.
    i am able to send and receive mails locally(within 192.168.1.20) that is to/fro between local users without issues.Now i installed centos in another machine with IP(192.168.1.40) and joined this machine to my local dns server(192.168.1.20).I am able to ping the machines from each other but sending and receiving mails fail).

    FQDN of the dns server(OPENSUSE 11.1) is suse1.dns.internal(machine 1)
    FQDN of the centos machine is centos.dns.internal(machine 2)

    when i run mailq command after sending the mail from user@machine1 to user@machine2 the following error i get and similar error while sending from user@machine 1 to user@machine 2.
    root@suse1#sendmail -v guest_user@centos.dns.internal

    #####gave some subject and text ,saved and mailed#######
    root@suse1#mailq


    -Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
    1A32242045 599 Thu Aug 20 15:55:10 root@dns.internal
    (connect to suse1.dns.internal[192.168.1.20]:25: Connection refused)
    guest_user@dns.internal

    12C0942066 1931 Thu Aug 20 18:19:44 MAILER-DAEMON
    (connect to suse1.dns.internal[192.168.1.20]:25: Connection refused)
    root@dns.internal

    7A31142048 2182 Thu Aug 20 15:53:08 MAILER-DAEMON
    (connect to suse1.dns.internal[192.168.1.20]:25: Connection refused)
    root@dns.internal

    05B3A42074 293 Thu Aug 20 19:46:43 root@dns.internal
    (connect to centos.dns.internal[192.168.1.40]:25: Connection refused)
    root@centos.dns.internal

    987764206B 1943 Thu Aug 20 18:44:12 MAILER-DAEMON
    (connect to suse1.dns.internal[192.168.1.20]:25: Connection refused)
    root@dns.internal

    6B33C42069 317 Thu Aug 20 18:43:55 root@dns.internal
    (connect to centos.dns.internal[192.168.1.40]:25: No route to host)
    guest_user@centos.dns.internal

    599E44206F 2351 Thu Aug 20 19:41:42 MAILER-DAEMON
    (connect to suse1.dns.internal[192.168.1.20]:25: Connection refused)
    root@dns.internal

    C28F74205E 2758 Thu Aug 20 17:19:12 MAILER-DAEMON
    (connect to suse1.dns.internal[192.168.1.20]:25: Connection refused)
    root@dns.internal

    E559C42063 291 Thu Aug 20 18:19:38 root@dns.internal
    (connect to centos.dns.internal[192.168.1.40]:25: No route to host)
    root@centos.dns.internal

    2FFC742054 599 Thu Aug 20 16:01:02 root@dns.internal
    (delivery temporarily suspended: connect to suse1.dns.internal[192.168.1.20]:25: Connection refused)
    guest_user@dns.internal

    2C0D942077 1839 Thu Aug 20 19:46:51 MAILER-DAEMON
    (connect to suse1.dns.internal[192.168.1.20]:25: Connection refused)
    root@dns.internal

    8A23042058 2758 Thu Aug 20 17:14:12 MAILER-DAEMON
    (delivery temporarily suspended: connect to suse1.dns.internal[192.168.1.20]:25: Connection refused)
    root@dns.internal

    ####Similarly while trying to send mails from centos machine to my suse machine #####

    root@centos#sendmail -v root@suse1.dns.internal
    root@centos#mailq

    /var/spool/mqueue (2 requests)
    -----Q-ID----- --Size-- -----Q-Time----- ------------Sender/Recipient-----------
    n7KEIBPA002254 0 Thu Aug 20 19:48 <guest_user@centos.dns.internal>
    (Deferred: Connection refused by suse1.dns.internal.)
    <root@suse1.dns.internal>
    n7KCjQcp003781 12 Thu Aug 20 18:15 <root@centos.dns.internal>
    (Deferred: Connection refused by suse1.dns.internal.)
    <root@suse1.dns.internal>
    Total requests: 2



    I tried checking for dig nslookup frm both the machines.No problems in name resolution.Should i do anything with the confguration files?

    And also i got a mailer delivery mail

    Date: Fri, 21 Aug 2009 12:35:14 +0530
    From: Mail Delivery Subsystem <MAILER-DAEMON@centos.dns.internal>
    To: <root@centos.dns.internal>
    Subject: Warning: could not send message for past 4 hours
    Auto-Submitted: auto-generated (warning-timeout)

    [-- Attachment #1 --]
    [-- Type: text/plain, Encoding: 7bit, Size: 0.5K --]

    **********************************************
    ** THIS IS A WARNING MESSAGE ONLY **
    ** YOU DO NOT NEED TO RESEND YOUR MESSAGE **
    **********************************************

    The original message was received at Thu, 20 Aug 2009 18:15:26 +0530
    from centos.dns.internal [127.0.0.1]

    ----- Transcript of session follows -----
    <root@suse1.dns.internal>... Deferred: Connection refused by suse1.dns.internal.
    Warning: message still undelivered after 4 hours
    Will keep trying until message is 5 days old

    [-- Attachment #2 --]
    [-- Type: message/delivery-status, Encoding: 7bit, Size: 0.3K --]

    Reporting-MTA: dns; centos.dns.internal
    Arrival-Date: Thu, 20 Aug 2009 18:15:26 +0530

    Final-Recipient: RFC822; root@suse1.dns.internal
    Action: delayed
    Status: 4.4.1
    Remote-MTA: DNS; suse1.dns.internal
    Last-Attempt-Date: Fri, 21 Aug 2009 12:35:14 +0530
    Will-Retry-Until: Tue, 25 Aug 2009 18:15:26 +0530

    [-- Attachment #3 --]
    [-- Type: message/rfc822, Encoding: 7bit, Size: 0.7K --]

    Date: Thu, 20 Aug 2009 18:15:26 +0530
    From: root <root@centos.dns.internal>
    To: root@suse1.dns.internal
    Subject: Testing
    User-Agent: Mutt/1.4.2.2i

    Hi testing



    Please help me in this regard...Thanks

  2. #2

    Default Re: Not able to send mails between one machine to another

    -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA1

    Well you've certainly found the issue.... did you try using Google to
    search on 'Connection Refused'? It would appear you have not told the
    receiving machine to listen on a non-localhost IP using port 25 (the
    default SMTP port) and as a result it, like every other mail server on
    Linux by default, is probably listening only on 127.0.0.1:25 instead of
    yourPublicIP:25 so even if your firewall is not blocking port 25 you still
    do not have a socket to which you can connect. Reconfigure Postfix to
    listen on its other IPs and you will likely be done.

    Good luck.





    fizeeosuse wrote:
    > Hi all,
    >
    > I have configured Post fix installation for a local dns
    > server(with domain name as dns.internal) in OPEN SUSE 11.1 .I have set
    > the dns A ,NS, MX record accordingly.Since i am learning i have used the
    > same server for both dns as well as mail server and IP of the machine is
    > 192.168.1.20.
    > i am able to send and receive mails locally(within 192.168.1.20) that
    > is to/fro between local users without issues.Now i installed centos in
    > another machine with IP(192.168.1.40) and joined this machine to my
    > local dns server(192.168.1.20).I am able to ping the machines from each
    > other but sending and receiving mails fail).
    >
    > FQDN of the dns server(OPENSUSE 11.1) is suse1.dns.internal(machine 1)
    > FQDN of the centos machine is centos.dns.internal(machine 2)
    >
    > when i run mailq command after sending the mail from user@machine1 to
    > user@machine2 the following error i get and similar error while sending
    > from user@machine 1 to user@machine 2.
    > root@suse1#sendmail -v guest_user@centos.dns.internal
    >
    > #####gave some subject and text ,saved and mailed#######
    > root@suse1#mailq
    >
    >
    > -Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
    > 1A32242045 599 Thu Aug 20 15:55:10 root@dns.internal
    > (connect to suse1.dns.internal[192.168.1.20]:25: Connection
    > refused)
    > guest_user@dns.internal
    >
    > 12C0942066 1931 Thu Aug 20 18:19:44 MAILER-DAEMON
    > (connect to suse1.dns.internal[192.168.1.20]:25: Connection
    > refused)
    > root@dns.internal
    >
    > 7A31142048 2182 Thu Aug 20 15:53:08 MAILER-DAEMON
    > (connect to suse1.dns.internal[192.168.1.20]:25: Connection
    > refused)
    > root@dns.internal
    >
    > 05B3A42074 293 Thu Aug 20 19:46:43 root@dns.internal
    > (connect to centos.dns.internal[192.168.1.40]:25: Connection
    > refused)
    > root@centos.dns.internal
    >
    > 987764206B 1943 Thu Aug 20 18:44:12 MAILER-DAEMON
    > (connect to suse1.dns.internal[192.168.1.20]:25: Connection
    > refused)
    > root@dns.internal
    >
    > 6B33C42069 317 Thu Aug 20 18:43:55 root@dns.internal
    > (connect to centos.dns.internal[192.168.1.40]:25: No route
    > to host)
    > guest_user@centos.dns.internal
    >
    >
    > 599E44206F 2351 Thu Aug 20 19:41:42 MAILER-DAEMON
    > (connect to suse1.dns.internal[192.168.1.20]:25: Connection
    > refused)
    > root@dns.internal
    >
    > C28F74205E 2758 Thu Aug 20 17:19:12 MAILER-DAEMON
    > (connect to suse1.dns.internal[192.168.1.20]:25: Connection
    > refused)
    > root@dns.internal
    >
    > E559C42063 291 Thu Aug 20 18:19:38 root@dns.internal
    > (connect to centos.dns.internal[192.168.1.40]:25: No route
    > to host)
    > root@centos.dns.internal
    >
    > 2FFC742054 599 Thu Aug 20 16:01:02 root@dns.internal
    > (delivery temporarily suspended: connect to
    > suse1.dns.internal[192.168.1.20]:25: Connection refused)
    > guest_user@dns.internal
    >
    > 2C0D942077 1839 Thu Aug 20 19:46:51 MAILER-DAEMON
    > (connect to suse1.dns.internal[192.168.1.20]:25: Connection
    > refused)
    > root@dns.internal
    >
    > 8A23042058 2758 Thu Aug 20 17:14:12 MAILER-DAEMON
    > (delivery temporarily suspended: connect to
    > suse1.dns.internal[192.168.1.20]:25: Connection refused)
    > root@dns.internal
    >
    > ####Similarly while trying to send mails from centos machine to my suse
    > machine #####
    >
    > root@centos#sendmail -v root@suse1.dns.internal
    > root@centos#mailq
    >
    > /var/spool/mqueue (2 requests)
    > -----Q-ID----- --Size-- -----Q-Time-----
    > ------------Sender/Recipient-----------
    > n7KEIBPA002254 0 Thu Aug 20 19:48
    > <guest_user@centos.dns.internal>
    > (Deferred: Connection refused by suse1.dns.internal.)
    >
    > <root@suse1.dns.internal>
    > n7KCjQcp003781 12 Thu Aug 20 18:15 <root@centos.dns.internal>
    > (Deferred: Connection refused by suse1.dns.internal.)
    >
    > <root@suse1.dns.internal>
    > Total requests: 2
    >
    >
    >
    > I tried checking for dig nslookup frm both the machines.No problems in
    > name resolution.Should i do anything with the confguration files?
    >
    > And also i got a mailer delivery mail
    >
    > Date: Fri, 21 Aug 2009 12:35:14 +0530
    > From: Mail Delivery Subsystem <MAILER-DAEMON@centos.dns.internal>
    > To: <root@centos.dns.internal>
    > Subject: Warning: could not send message for past 4 hours
    > Auto-Submitted: auto-generated (warning-timeout)
    >
    > [-- Attachment #1 --]
    > [-- Type: text/plain, Encoding: 7bit, Size: 0.5K --]
    >
    > **********************************************
    > ** THIS IS A WARNING MESSAGE ONLY **
    > ** YOU DO NOT NEED TO RESEND YOUR MESSAGE **
    > **********************************************
    >
    > The original message was received at Thu, 20 Aug 2009 18:15:26 +0530
    > from centos.dns.internal [127.0.0.1]
    >
    > ----- Transcript of session follows -----
    > <root@suse1.dns.internal>... Deferred: Connection refused by
    > suse1.dns.internal.
    > Warning: message still undelivered after 4 hours
    > Will keep trying until message is 5 days old
    >
    > [-- Attachment #2 --]
    > [-- Type: message/delivery-status, Encoding: 7bit, Size: 0.3K --]
    >
    > Reporting-MTA: dns; centos.dns.internal
    > Arrival-Date: Thu, 20 Aug 2009 18:15:26 +0530
    >
    > Final-Recipient: RFC822; root@suse1.dns.internal
    > Action: delayed
    > Status: 4.4.1
    > Remote-MTA: DNS; suse1.dns.internal
    > Last-Attempt-Date: Fri, 21 Aug 2009 12:35:14 +0530
    > Will-Retry-Until: Tue, 25 Aug 2009 18:15:26 +0530
    >
    > [-- Attachment #3 --]
    > [-- Type: message/rfc822, Encoding: 7bit, Size: 0.7K --]
    >
    > Date: Thu, 20 Aug 2009 18:15:26 +0530
    > From: root <root@centos.dns.internal>
    > To: root@suse1.dns.internal
    > Subject: Testing
    > User-Agent: Mutt/1.4.2.2i
    >
    > Hi testing
    >
    >
    >
    > Please help me in this regard...Thanks
    >
    >

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