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Thread: Multiple hosts in "Inbound SMTP host name"

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  1. #1
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    Default Multiple hosts in "Inbound SMTP host name"

    Hello,

    I found some threads but no real answer how to configure multiple hosts for the "Inbound SMTP host name" in the UI. Is it possible (it must be!) and if, how is it entered (comma or space separated)?

    Thanx

    __Leo

  2. #2
    phoenix is offline Zimbra Consultant & Moderator
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    I don't understand what you mean by '......configure multiple hosts....', what exactly are you trying to do and why?
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

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    Hello,

    if you have an external mail relay, you have to configure "Inbound SMTP Host name" in the domains to validate incoming SMTP traffic. Usually every external mail provider has at least two mx-entries in the DNS to recieve mail, so each of this hosts can receive and forward mail. To my understanding, all hosts of the external provider which are listed as mx records in the DNS have to be listed in the "Inbound SMTP Host name". How can I do this?

    __Leo

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    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by LeoKurz View Post
    if you have an external mail relay, you have to configure "Inbound SMTP Host name" in the domains to validate incoming SMTP traffic.
    There's a contradiction in that statement An 'external mail relay' is a server through which you are relaying mail for delivery, is that what you're doing? If it is you need do nothing other than relay through that server and possibly authenticate to do that.

    Quote Originally Posted by LeoKurz View Post
    Usually every external mail provider has at least two mx-entries in the DNS to recieve mail, so each of this hosts can receive and forward mail.
    The two MX records just indicate a primary and backup (or possibly load-balanced) mail servers.

    Quote Originally Posted by LeoKurz View Post
    To my understanding, all hosts of the external provider which are listed as mx records in the DNS have to be listed in the "Inbound SMTP Host name". How can I do this?
    This is the contradiction in your first question, are they relaying through your server? If they are they just need to use port 587 and authenticate to send mail via your server. Nothing else needs to be done and nothing needs to be changed.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

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    Mails are sent to my ISP, that's why *their* Mailservers are listed in the mx records of my domain. Then these servers forward the mails per smtp to my zimbra server. This is a very common sceario if you e.g. host virus scanning at an external provider. This is exactly the case when you, acording to the manual, are supposed to configure "Inbound SMTP Host name" as the mx check will not repoert the zimbra server as mail host. But in most cases, there are at least two servers listed as mx records but the "Inbound SMTP Host name" in general or domain configuration only allows on host. But IMHO all hosts listed as mx entries in the domain have to go into this configuration.

    __Leo

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    Knock,knock, any news on this? When I understand zimbra-attrs.xml right, the attr id="744" name="zimbraDNSCheckHostname" only allows a single value?! The description is quite obvious: "This attribute is used for DNS check by customers that configure their MX to point at spam relays or other non-zimbra inbox smtp servers". This is *very* common, at least with our customers, but I can't think of a provider who only has a single server set in the mx records. What happens if the second (third, forth...) sever relays to the zimbra server? Is the mail rejected?

    __Leo

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