Domain – setup an MX record for a particular user email address

domainemail-servermx-record

I would like to configure 2 MX records :
– One MX record that identifies an email server to the domain @mycompany.com that will handle all of the emails except one email
– Another MX Record that will redirect to another email server if the address email is: me@mycompany.com

Is it possible? If yes, how can I achieve it?

Thanks,

Fabien

Best Answer

You can't do this by indicating multiple the MX records for the same (sub)domain. The mail will be delivered to the server(s) defined by your MX record regardin only the (sub)domain, without any look at the user@... Mail routing is done on the (sub)domain part only.

Possible solutions :

You can use subdomains, to re-route easily : me@sub.domain.com . The drawback is that you have to change your email address and ask your contacts to update theirs.
However, there's nothing stopping that mail server being an application that forwards mail onto several other servers based on the user name of the recipient... i.e. tell your mail client to forward all incoming messages for me@domain.com to an other mail server.

Related Solutions

Domain – How should I setup separate MX records for a subdomain

You should never point your MX to a IP address to be RFC compliant. Make an A record for the IP address instead and point the MX record to it.

Then the zone should look like this,

    @               IN      MX      1       ASPMX.L.GOOGLE.COM.
    @               IN      MX      5       ALT1.ASPMX.L.GOOGLE.COM.
    @               IN      MX      5       ALT2.ASPMX.L.GOOGLE.COM.
    @               IN      MX      10      ASPMX2.GOOGLEMAIL.COM.
    @               IN      MX      10      ASPMX3.GOOGLEMAIL.COM.
    @               IN      MX      10      ASPMX4.GOOGLEMAIL.COM.
    @               IN      MX      10      ASPMX5.GOOGLEMAIL.COM.
    @               IN      A       10.24.233.214
    mailer          IN      A       10.24.233.214
    mailer          IN      MX      10      mailer.cranketywidgets.com.

Sendmail: forward wildcard MX to a single email address

As you noted, you need a DNS wildcard.

When mail from the wildcard addresses comes in, sendmail doesn't know what to do with it. You can fix that by adding a sendmail rewrite rule to rewrite the wild subdomain parts into the main domain part.

in your sendmail.mc:

LOCAL_NET_CONFIG  
R $+ < @ $+ .example.com. > $*    $: $1 < @ example.com > $3       dnl

Note that you need a tab to separate the left-hand side rule from the right-hand side replacement. ($* ends the left-hand side; $: starts the right-hand side.) Note that the trailing dot on the left-hand side may or may not be necessary. Also note you need a second tab after the right-hand side and the comment (between $3 and dnl).

You'll want to make sure example.com is in your relay-domains file.

Once the domain has been collapsed by the rewrite rule, you can route all mail for the domain to a single user with a virtusertable entry:

@example.com  luser

That should about do it.

Best Answer

Related Solutions

Domain – How should I setup separate MX records for a subdomain

Sendmail: forward wildcard MX to a single email address

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