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Thread: Replaced failed router; Now email can send, but not receive

  1. #1
    OStrich is offline New Member
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    Default Replaced failed router; Now email can send, but not receive

    I replaced an old D-Link DIR-615 v.E3 that had failed with a Netgear WNDR4500. I haven't adjusted or added any settings to the base configuration of the Netgear router, but the data is able to be sent out so I'm a bit confused.

    I'm assuming the problem is with the configuration of the router, but I'm hoping I can get some direction. This is the message I find in zimbra.log:
    Code:
    Sep 17 05:47:18 srv1 postfix/qmgr[4934]: A3B7C610C83: from=<ourUser@ourDomain.com>, size=1956, nrcpt=1 (queue active)
    
    Sep 17 05:47:48 srv1 postfix/smtp[32522]: connect to mx.fakemx.net[46.4.167.9]: Connection timed out (port 25)
    
    Sep 17 05:47:48 srv1 postfix/smtp[32522]: A3B7C610C83: host mx.fakemx.net[176.9.102.185] refused to talk to me: 421 mx.fakemx.net Service Unavailable
    
    Sep 17 05:47:49 srv1 postfix/smtp[32522]: A3B7C610C83: host mx.fakemx.net[5.9.56.252] said: 451 Try again later (in reply to RCPT TO command)
    
    Sep 17 05:47:49 srv1 postfix/smtp[32522]: A3B7C610C83: to=<theirUser@theirDomain.com>, relay=mx.fakemx.net[92.48.126.227]:25, delay=323819, delays=323788/0.01/32/0, dsn=4.0.0, status=deferred (host mx.fakemx.net[92.48.126.227] refused to talk to me: 421 mx.fakemx.net Service Unavailable)
    The following is from a port scan at mxtoolbox.com:
    Code:
    Status	Port	Name	Result	Time (ms)
     	21	ftp	Thread was being aborted.	0
     	22	ssh	An operation was attempted on something that is not a socket 173.160.211.45:22	0
     	23	telnet	An operation was attempted on something that is not a socket 173.160.211.45:23	0
     	25	smtp	Thread was being aborted.	0
     	53	dns	Thread was being aborted.	0
     	80	http	Thread was being aborted.	0
     	110	pop3	Thread was being aborted.	0
     	143	imap	Thread was being aborted.	0
     	139	netbios	Thread was being aborted.	0
     	389	ldap	Thread was being aborted.	0
     	443	https	Thread was being aborted.	0
     	587	msa-outlook	Thread was being aborted.	0
     	1352	lotus notes	Thread was being aborted.	0
     	1433	sql server	Thread was being aborted.	0
     	3306	my sql	Thread was being aborted.	0
     	3389	remote desktop	Thread was being aborted.	0
     	8080	webcache	Timeout	0
    I probably left out a bunch of information that would be necessary, but I'm really hoping you guys can help me with some direction. Thanks!

  2. #2
    phoenix is online now Zimbra Consultant & Moderator
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    Quote Originally Posted by OStrich View Post
    I replaced an old D-Link DIR-615 v.E3 that had failed with a Netgear WNDR4500. I haven't adjusted or added any settings to the base configuration of the Netgear router, but the data is able to be sent out so I'm a bit confused.
    As you're behind a NAT router, do you have a Split DNS (you should)? I'd suggest you go to that article and run all the commands in the 'Verify....' section to confirm your DNS settings.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  3. #3
    OStrich is offline New Member
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    Thanks for replying, Phoenix.

    Here's what I get:
    dig mydomain.com mx
    Code:
    ; <<>> DiG 9.2.4 <<>> xxxxxxxx.com mx
    ;; global options:  printcmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 30043
    ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0
    
    ;; QUESTION SECTION:
    ;xxxxxxxx.com.                IN      MX
    
    ;; ANSWER SECTION:
    xxxxxxxx.com. 38400    IN      MX      10 srv1.xxxxxxxx.com.
    
    ;; AUTHORITY SECTION:
    xxxxxxxx.com. 38400    IN      NS       dns.xxxxxxxx.com
    
    ;; Query time: 1 msec
    ;; SERVER: 192.168.1.254#53(192.168.1.254)
    ;; WHEN: Tue Sep 18 10:46:22 2012
    ;; MSG SIZE  rcvd: 90
    dig mydomain.com any
    Code:
    ; <<>> DiG 9.2.4 <<>> xxxxxxxx.com mx
    ;; global options:  printcmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2644
    ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0
    
    ;; QUESTION SECTION:
    ;xxxxxxxx.com.                IN      ANY
    
    ;; ANSWER SECTION:
    xxxxxxxx.com. 38400    IN      SOA     srv1.xxxxxxxx.com. admin.xxxxxxxx.com. 1134434704  800 3600 604800 28400
    xxxxxxxx.com. 38400    IN      NS       dns.xxxxxxxx.com.
    xxxxxxxx.com. 38400    IN      MX      10 srv1.xxxxxxxx.com.xxxxxxxx.com.
    xxxxxxxx.com. 38400    IN      A         192.168.1.254
    
    ;; Query time: 14 msec
    ;; SERVER: 192.168.1.254#53(192.168.1.254)
    ;; WHEN: Tue Sep 18 10:46:44 2012
    ;; MSG SIZE  rcvd: 153
    host $(hostname)
    Code:
    srv1.xxxxx-xxxxx.com has address 192.168.1.254
    cat /etc/resolv.conf
    Code:
    nameserver 192.168.1.254
    nameserver 192.168.1.1
    cat /etc/hosts
    Code:
    # Do not remove the following line, or various programs
    # that require network functionality will fail.
    127.0.0.1 localhost.localdomain localhost
    192.168.1.254 srv1.xxxxx-xxxxx.com      www.xxxxx-xxxxx.com     srv1     phdnet
    Thanks again for looking into this, Bill! I'll be monitoring the forum constantly now. This is our main email service and we've been down for over a day so it's been hectic. I really appreciate your help!


    EDIT: Additionally, I get an delay error response from my GMAIL when trying to send out to an email account on the zimbra server--
    [CODE]This is an automatically generated Delivery Status Notification

    THIS IS A WARNING MESSAGE ONLY.

    YOU DO NOT NEED TO RESEND YOUR MESSAGE.

    Delivery to the following recipient has been delayed:

    dispatch@xxxxxxxx.com

    Message will be retried for 2 more day(s)

    Technical details of temporary failure:
    The recipient server did not accept our requests to connect. Learn more at http://support.google.com/mail/bin/answer.py?answer=7720
    [(0) srv1.xxxxxxxx.com. [173.160.211.45]:25: No route to host]
    [\CODE]

    What I notice here is "No route to host". The IP address 173.160.211.45 doesn't correspond to the IP address accessed from the server. The server's IP comes up as 173.160.211.46. I hope this helps.
    Last edited by OStrich; 09-18-2012 at 01:52 PM. Reason: Adding Info

  4. #4
    burtyb is offline Starter Member
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    Hi,
    I'm one of the admins over at Fake MX - we temp fail all mail that hits our servers which is why you're seeing what you're seeing above. Without the real domain names it's hard to say but it's possible you've typo'd the domain and it lists mx.fakemx.net as the only MX and if this is the case then mail will always be deferred. If you want us to check from our end then you can contact us via http://www.fakemx.org/contact

    Chris.

  5. #5
    phoenix is online now Zimbra Consultant & Moderator
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    In addition to the comments in the post above you also don't appear to have an A record for your mail server.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  6. #6
    OStrich is offline New Member
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    Thanks for the response guys.

    Just a little more background information: The Zimbra server was running effectively enough before the router failed. Once the router failed, I installed a new, more powerful router. Prior to the router failing, I hadn't checked the MX records so I didn't realize there wasn't an A record setup consistent with the mail server. Would this be the reason we aren't able to receive incoming mail?

    In the past few hours, I've been concerned quite a bit with the external ip address inconsistency. Could my external ip have changed because of the routers' failure and reissued differing but a digit when the new router was installed causing the error with the data in the MX record? This is what it says when I do an MX Lookup:

    screenMXrecord091812.png

    We've been operating without static ips for close to 2 years and have been making due.

    It's also worth noting that we had this zimbra setup grandfathered in. Take that as you may though.

    I really appreciate your feedback and help through this. It's been a bit chaotic since the failing router incident. Please let me know if you think I should devote my time elsewhere or if this is worthy angle. I'd love to setup an accurate A record as well if you could point me in the right direction to where I could research that.

    Thanks again.

  7. #7
    phoenix is online now Zimbra Consultant & Moderator
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    Quote Originally Posted by OStrich View Post
    Would this be the reason we aren't able to receive incoming mail?
    Yes, this would be one reason.

    Quote Originally Posted by OStrich View Post
    Could my external ip have changed because of the routers' failure and reissued differing but a digit when the new router was installed causing the error with the data in the MX record?
    Yes, that's most likely the cause.

    Quote Originally Posted by OStrich View Post
    We've been operating without static ips for close to 2 years and have been making due.
    Not a good idea. You would most likely have problems with other mail servers if you're a) on a dynamic IP and b) do not have a valid reverse DNS for your IP.

    Quote Originally Posted by OStrich View Post
    I'd love to setup an accurate A record as well if you could point me in the right direction to where I could research that.
    The Split DNS article has full details of what your A record should look like for the internal DNS. For your external DNS the format is the same but should point to your external IP address.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

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