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Thread: new install, mail queued "host refused to talk to me" 421

  1. #1
    michael0584 is offline Member
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    Default new install, mail queued "host refused to talk to me" 421

    Hi, I just Installed Zimbra to replace an old exchange 5.5 server. Everything is working fine except email to certain domains, hotmail, gmail. I have messages queued with an error that states "host refused to talk to me: 421 smtp service not available" From what I understand this is normally from no reverse dns entry. We do have a reverse dns entry for oldserver.mydomain.com and I have just changed it to newserver.mydomain.com. Maybe I need to wait for it to propogate, but as I understand it, it should work either way since the domain and ip are correct. My mx record, spf record, and reverse dns all point to newserver.mydomain.com, but if I run an smtp check my server answers 250 mydomain.com instead of 250 newserver.mydomain.com. Is this a problem?

    Any help would be greatly appreciated, and by the way I love Zimbra

    Thanks,
    Michael

  2. #2
    phoenix is offline Zimbra Consultant & Moderator
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    You can start with the following for confirmation, go to the Split DNS article and run all the commands in the 'Verify...' section and post the output here.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

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    michael0584 is offline Member
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    [root@mail ~]# dig britishparts.com mx

    ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_5.3 <<>> britishparts.com mx
    ;; global options: printcmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62216
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 3

    ;; QUESTION SECTION:
    ;britishparts.com. IN MX

    ;; ANSWER SECTION:
    britishparts.com. 368 IN MX 10 mail.britishparts.com.

    ;; AUTHORITY SECTION:
    britishparts.com. 153751 IN NS mom.bcsengineering.com.
    britishparts.com. 153751 IN NS odie.bcsengineering.com.

    ;; ADDITIONAL SECTION:
    mail.britishparts.com. 2592000 IN A 10.0.0.16
    mom.bcsengineering.com. 145511 IN A 74.55.165.42
    odie.bcsengineering.com. 145511 IN A 70.60.131.5

    ;; Query time: 1 msec
    ;; SERVER: 10.0.0.16#53(10.0.0.16)
    ;; WHEN: Mon Feb 28 09:52:56 2011
    ;; MSG SIZE rcvd: 155

    [root@mail ~]#

  4. #4
    michael0584 is offline Member
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    [root@mail ~]# dig britishparts.com any

    ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_5.3 <<>> britishparts.com any
    ;; global options: printcmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29998
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 2, ADDITIONAL: 3

    ;; QUESTION SECTION:
    ;britishparts.com. IN ANY

    ;; ANSWER SECTION:
    britishparts.com. 221 IN TXT "v=spf1 a mx a:ntserver.britishparts.com a:mail.britishparts.com ip4:70.60.131.80/28 ip4:72.54.60.120/29 ~all"
    britishparts.com. 221 IN MX 10 mail.britishparts.com.
    britishparts.com. 221 IN A 70.60.131.84
    britishparts.com. 153604 IN NS mom.bcsengineering.com.
    britishparts.com. 153604 IN NS odie.bcsengineering.com.

    ;; AUTHORITY SECTION:
    britishparts.com. 153604 IN NS odie.bcsengineering.com.
    britishparts.com. 153604 IN NS mom.bcsengineering.com.

    ;; ADDITIONAL SECTION:
    mail.britishparts.com. 2592000 IN A 10.0.0.16
    mom.bcsengineering.com. 145364 IN A 74.55.165.42
    odie.bcsengineering.com. 145364 IN A 70.60.131.5

    ;; Query time: 0 msec
    ;; SERVER: 10.0.0.16#53(10.0.0.16)
    ;; WHEN: Mon Feb 28 09:55:23 2011
    ;; MSG SIZE rcvd: 320

    [root@mail ~]#

  5. #5
    michael0584 is offline Member
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    [root@mail ~]# host $(hostname)
    mail.britishparts.com has address 10.0.0.16
    mail.britishparts.com mail is handled by 10 mail.britishparts.com.
    [root@mail ~]#

  6. #6
    michael0584 is offline Member
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    Now this may be a problem.

    [root@mail ~]# cat /etc/resolv.conf
    search motorcarsltd.com
    search motorcarsltd.com

    nameserver 10.0.0.16
    nameserver 10.0.0.16


    I had this originally as
    search britishparts.com
    search motorcarsltd.com

    nameserver 10.0.0.16
    nameserver 10.0.0.16

    Not sure why it changed, we use both of these domains, maybe I formatted this wrong?

  7. #7
    michael0584 is offline Member
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    [root@mail ~]# cat /etc/hosts
    # Do not remove the following line, or various programs
    # that require network functionality will fail.
    127.0.0.1 localhost.localdomain localhost
    ::1 localhost6.localdomain6 localhost6
    10.0.0.16 mail.britishparts.com britishparts.com mail

  8. #8
    michael0584 is offline Member
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    [root@mail ~]# nslookup mail.britishparts.com
    Server: 10.0.0.16
    Address: 10.0.0.16#53

    Name: mail.britishparts.com
    Address: 10.0.0.16

  9. #9
    michael0584 is offline Member
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    As you can probably tell, the mailserver is behind a firewall, and I did setup the split dns, but maybe incorrectly. I originally had a problem with internal mail not being delivered. I disabled dns lookups in the admin console under servers and mta. This resolved the internal mail delivery problem. Just not sure why outgoing mail is getting queued.

  10. #10
    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by michael0584 View Post
    [root@mail ~]# cat /etc/hosts
    # Do not remove the following line, or various programs
    # that require network functionality will fail.
    127.0.0.1 localhost.localdomain localhost
    ::1 localhost6.localdomain6 localhost6
    10.0.0.16 mail.britishparts.com britishparts.com mail
    The hosts file is your problem, it should look like this:

    Code:
    # Do not remove the following line, or various programs
    # that require network functionality will fail.
    127.0.0.1               localhost.localdomain localhost
    ::1             localhost6.localdomain6 localhost6
    10.0.0.16       mail.britishparts.com    mail
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

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