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Thread: NAT Server reporting INTERNAL IP address in RCPT From

  1. #1
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    Default NAT Server reporting INTERNAL IP address in RCPT From

    Hello,
    My server is reporting the Internal IP address in the RCPT TO command --

    Here a log entry from a bounced mail:

    Code:
    NOQUEUE: reject: RCPT from host.domain.de[192.168.0.168]: 450 4.1.1 <info@bad-address.de>: Recipient address rejected: unverified address: host mail.bad-address.de[194.117.254.35] said: 451 temporary failure (#4.3.0) (in reply to RCPT TO command); from=<user@domain.de> to=<info@bad-address.de> proto=ESMTP helo=<host.domain.de>
    I think that the recipient servers might be rejecting my mails because the internal IP is in there. (192.168.0.168) I am not on any Blacklists.

    This is a NATted server and yes, I have successfully implemented a split DNS setup.
    I DO use a spam filter service from my ISP, so my MX is not the external IP address of the server, it is a different address.

    How can I get the proper IP (external address) to show in the RCPT FROM command?
    Does anyone have any other ideas as to why the failure above occurs, seemingly randomly, and only with a handful of recipients?

    Thanks,
    SG

  2. #2
    phoenix is offline Zimbra Consultant & Moderator
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    Default

    That mail server (according to the IP address) has an incorrect reverse DNS record, you should also provide some details of the headers from a rejected email. Also post details of your ZCS version with the output of the following command (and update your forum profile with that information):

    Code:
    zmcontrol -v
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  3. #3
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    Default

    Quote Originally Posted by phoenix View Post
    That mail server (according to the IP address) has an incorrect reverse DNS record
    I don't understand.

    The PTR for 194.117.254.35 resolves to a name other than the sending server, but why would that cause the delivery to fail?

    I do not have any AV/SPAM services running.

    Advice?

    SG

    --

    edit my version number is up to date in my profile - Release 8.0.4.GA.5737.UBUNTU12.64 UBUNTU12_64 FOSS edition.
    Last edited by SGIA; 11-25-2013 at 10:38 AM. Reason: Version number

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