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Thread: Selected IP for SMTP outbound

  1. #1
    deckard-x is offline Starter Member
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    Default Selected IP for SMTP outbound

    Hello,

    I'm using latest version of Zimba ZCS 6.0.10. Big thanks for really hard work guys! Zimbra ROX!

    I have one quite big problem related to my IP address. Right now I have 4 IP's on my dedicated server. Unfortunately the main IP has been blacklisted because of the problem with revDNS. I'm working with the ISP to resolve the problem but 3 other IP's are 100% OK (with the REV DNS). Also my question is: how to force Zimbra to use backup IP (which is already configured as eth0:1) as the SMTP outcome (from the Zimbra to the internet) traffic ?

  2. #2
    nix
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    Default

    +1 .......

  3. #3
    nix
    nix is offline Member
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    After a little research I think there are a couple of ways to do this however...

    My main question is: after all the virus/spam checking, how is mail to a local destination delivered? Does it use the SMTP client or does in end up in the message store some other way.

    If the latter, it should be a simple matter of editing /opt/zimbra/postfix/conf/master.cf.in as follows (addition in bold) as the SMTP client would only be used to deliver mail to external domains.
    Code:
    .
    .
    proxymap  unix  -       -       n       -       -       proxymap
    smtp      unix  -       -       n       -       -       smtp
            -o smtp_bind_address=x.x.x.x
    # When relaying mail as backup MX, disable fallback_relay to avoid MX loops
    relay     unix  -       -       n       -       -       smtp
            -o fallback_relay=
    .
    If however, the SMTP client is used to deliver external AND local mail (after spam/virus filter) then one could use a transport map which would contain all local domains and use the smtp-local service for these and all other mail would use the standard smtp service. A pain to administer tho...
    Code:
    .
    .
    proxymap  unix  -       -       n       -       -       proxymap
    smtp      unix  -       -       n       -       -       smtp
            -o smtp_bind_address=x.x.x.x
    smtp-local      unix  -       -       n       -       -       smtp
            -o smtp_bind_address=127.0.0.1
    # When relaying mail as backup MX, disable fallback_relay to avoid MX loops
    relay     unix  -       -       n       -       -       smtp
            -o fallback_relay=
    .
    in theory anyway...

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