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Thread: [SOLVED] force zimbra to check reverse DNS for incoming mails

  1. #1
    snake_eyes's Avatar
    snake_eyes is offline Advanced Member
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    Default [SOLVED] force zimbra to check reverse DNS for incoming mails

    Hello,

    How to force zimbra to check the reverse DNS for the incoming traffic, if it can't resolve it reject the emails to the sender...

    Cheers,
    - In a world without walls and fences who needs windows and gates?
    - I am Running Linux.. Finally, my PC is valid & Reliable Hereafter.

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    snake_eyes's Avatar
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    no experts ?
    - In a world without walls and fences who needs windows and gates?
    - I am Running Linux.. Finally, my PC is valid & Reliable Hereafter.

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    mmorse's Avatar
    mmorse is offline Moderator
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    su - zimbra
    zmprov mcf +zimbraMtaRestriction reject_unknown_client
    zmprov gacf | grep zimbraMtaRestriction
    postfix reload

    ~

    DNS checks:

    reject_unknown_sender_domain - Reject the request when the sender mail address domain has no DNS A or MX record. The unknown_address_reject_code is usually 450 in case of a temporary DNS error.

    reject_unknown_client - Reject the request when the client IP address has no PTR (address to name) record in the DNS, or when the PTR record does not have a matching A (name to address) record.

    reject_unknown_hostname - Reject the request when the hostname in the client HELO (EHLO) greeting command has no DNS A or MX record. The unknown_hostname_reject_code is defaulted to 450.


    Protocol Checks:

    reject_non_fqn_hostname - Sender address must be a fully qualified, such as sender@domain.com (on default).

    reject_invalid_hostname - If hostname in EHLO greeting violates RFC (on default).

    reject_non_fqdn_hostname - Client must greet with a fully qualified hostname.

  4. #4
    phoenix is online now Zimbra Consultant & Moderator
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    There's always some light week-end reading here: Postfix Documentation
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

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    snake_eyes's Avatar
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    thank you phonix, solved
    - In a world without walls and fences who needs windows and gates?
    - I am Running Linux.. Finally, my PC is valid & Reliable Hereafter.

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