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    Question Cannot send mail due to weird IPv6 error


    I dont know what happened but when i try to send mail i cannot die to the following error:

    Code:
    his is the mail system at host nexus.localdomain.
    
    I'm sorry to have to inform you that your message could not
    be delivered to one or more recipients. It's attached below.
    
    For further assistance, please send mail to postmaster.
    
    If you do so, please include this problem report. You can
    delete your own text from the attached returned message.
    
                       The mail system
    
    <my_personal_mail@gmail.com>: host gmail-smtp-in.l.google.com[2607:f8b0:4001:c1b::1a]
        said: 550-5.7.1 [2607:5501:1000:1ef::692b] Our system has detected that
        this message 550-5.7.1 does not meet IPv6 sending guidelines regarding PTR
        records and 550-5.7.1 authentication. Please review 550-5.7.1
        https://support.google.com/mail/?p=ipv6_authentication_error for more 550
        5.7.1 information. l128si7842073iol.116 - gsmtp (in reply to end of DATA
        command)

    Reading mail works though.

    Any idea on how to fix this?

    I do have set rDNS Record (PTR) to mail.superhost.gr and IPv6 is enabled in my VPS.
  2. #2
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    I don't see an AAAA record for mail.superhost.gr.
  4. #3
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    Question Cannot send mail due to some IPv6 issue


    Code:
    From	
    MAILER-DAEMON@nexus.localdomain (Mail Delivery System)	Find email with same sender
    To	
    my_personal_mail@superhost.gr	Find email with recipient
    Date	09/04/2016 08:29
    Subject	
    Undelivered Mail Returned to Sender	Find email with same subject
    Message contents
    This is the mail system at host nexus.localdomain.
    
    I'm sorry to have to inform you that your message could not
    be delivered to one or more recipients. It's attached below.
    
    For further assistance, please send mail to postmaster.
    
    If you do so, please include this problem report. You can
    delete your own text from the attached returned message.
    
                       The mail system
    
    <my_personal_mail@gmail.com>: host gmail-smtp-in.l.google.com[2607:f8b0:4001:c1b::1a]
        said: 550-5.7.1 [2607:5501:1000:1ef::692b] Our system has detected that
        this message 550-5.7.1 does not meet IPv6 sending guidelines regarding PTR
        records and 550-5.7.1 authentication. Please review 550-5.7.1
        https://support.google.com/mail/?p=ipv6_authentication_error for more 550
        5.7.1 information. l128si7842073iol.116 - gsmtp (in reply to end of DATA
        command)
    Can you please explain to me why i cannot send this email, although i cna receive with no problem?

    I have set my rDNS (PTR) record for both IPv4 & IPv6 to 'mail.superhost.gr'
  6. #4
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    It does exist though.

    Code:
    [root@cvps8766660911 ~]# traceroute -6 2607:5501:1000:1ef::692b
    traceroute to 2607:5501:1000:1ef::692b (2607:5501:1000:1ef::692b), 30
    hops max, 80 byte packets
    1 mail.superhost.gr (2607:5501:1000:1ef::692b) 0.044 ms 0.016 ms 0.013 ms
    [root@cvps8766660911 ~]#
  8. #5
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    Threads merged and moved.

    Originally Posted by Nik
    It does exist though.
    It's good that the server does exist at that IPv6 address. I never said it didn't.

    I said the AAAA DNS record for mail.superhost.gr does not exist.
  10. #6
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    Originally Posted by requinix
    Threads merged and moved.


    It's good that the server does exist at that IPv6 address. I never said it didn't.

    I said the AAAA DNS record for mail.superhost.gr does not exist.

    Aaaj i see!

    Could you please inform me on how to add that missing AAAA record in the DNS Zone of my VPS?!



    p.s: Sorry for the double post. Consused as to where to ask.
  12. #7
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    I don't know your VPS. Look around for something about DNS.
  14. #8
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    Can you tell me how to add it via console?
  16. #9
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    I still don't know your VPS. But I can say that unless you're running the DNS server yourself, like with bind, then you probably can't do it through a console.
  18. #10
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    Στιγμιότυπο από 2016-04-09.png


    Here is a screenshot of my VirtualMin Panel.
    I control most of the VPS functions from here.

    Could you please tell me how to apply?

    Create new quad-A DNS record and then give the IPv6 ip address there?
  20. #11
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    Originally Posted by Nik
    Create new quad-A DNS record and then give the IPv6 ip address there?
    Yes.
  22. #12
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    Code:
    $ttl 38400
    @	IN	SOA	ns1.superhost.gr. root.ns1.superhost.gr. (
    			1455847768
    			10800
    			3600
    			604800
    			38400 )
    @	IN	NS	ns1.superhost.gr.
    @	IN	NS	ns2.superhost.gr.
    superhost.gr.	IN	A	104.168.171.101
    www.superhost.gr.	IN	A	104.168.171.101
    ftp.superhost.gr.	IN	A	104.168.171.101
    m.superhost.gr.	IN	A	104.168.171.101
    ns1.superhost.gr.	IN	A	104.168.171.101
    ns2.superhost.gr.	IN	A	104.168.171.101
    localhost.superhost.gr.	IN	A	127.0.0.1
    webmail.superhost.gr.	IN	A	104.168.171.101
    admin.superhost.gr.	IN	A	104.168.171.101
    mail.superhost.gr.	IN	A	104.168.171.101
    superhost.gr.	IN	MX	5 mail.superhost.gr.
    superhost.gr.	IN	TXT	"v=spf1 a mx a:superhost.gr ip4:104.168.171.101 ?all"
    autoconfig.superhost.gr.	IN	A	104.168.171.101
    Could you please show me how byadding the missing PTR record in the DNS Zone file?
  24. #13
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    The pointers seem to be working fine. I'm not sure why they aren't listed on that one page. Did you see anything about zones? Like you clicked the "superhost.gr" zone to get to that page? Pointers will be in a different zone - according to the IP address.
  26. #14
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    I workarounded it by altering the System hostname from 'nexus' => 'mail.superhost.gr'

    and after a reboot intrinsically a PTR record must came to be.

    Still, i see no PTR record though to the zone file info i have provided, so if you ask me on how to re-do it myself by altering the zone file i cannot.
  28. #15
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    Okey my company finally understood that and fixed it but look

    Code:
    [nikos@dell ~]$ dig +short @ns1.superhost.gr mail.superhost.gr AAAA
    2607:5501:1000:1ef::692b
    
    
    [nikos@dell ~]$ traceroute -6 2607:5501:1000:1ef::692b
    traceroute to 2607:5501:1000:1ef::692b (2607:5501:1000:1ef::692b), 30 hops max, 80 byte packets
    connect: Network not available

    Please explain to me the difference.

    because now that i have an AAAA record for mail.superhost.gr

    the traceroute doesnt respond as it were few post ago.

    Can you please explain to me what the differnce between those too in a bit of detail?

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