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Postfix Documentation
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Example: virtual domains/addresses

If you want to keep information for virtual lookups in your directory, it's only a little more complicated. First, you need to make sure Postfix knows about the virtual domain. An easy way to do that is to add the domain to the mailacceptinggeneralid attribute of some entry in the directory. Next, you'll want to make sure all of your virtual recipient's mailacceptinggeneralid attributes are fully qualified with their virtual domains. Finally, if you want to designate a directory entry as the default user for a virtual domain, just give it an additional mailacceptinggeneralid (or the equivalent in your directory) of "@virtual.dom". That's right, no user part. If you don't want a catchall user, omit this step and mail to unknown users in the domain will simply bounce.

In summary, you might have a catchall user for a virtual domain that looks like this:

     dn: cn=defaultrecipient, dc=fake, dc=dom
     objectclass: top
     objectclass: virtualaccount
     cn: defaultrecipient
     owner: uid=root, dc=someserver, dc=isp, dc=dom
1 -> mailacceptinggeneralid: fake.dom
2 -> mailacceptinggeneralid: @fake.dom
3 -> maildrop: [email protected]         

1: Postfix knows fake.dom is a valid virtual domain when it looks for this and gets something (the maildrop) back.

2: This causes any mail for unknown users in fake.dom to go to this entry ...

3: ... and then to its maildrop.

Normal users might simply have one mailacceptinggeneralid and maildrop, e.g. "[email protected]" and "[email protected]".

Postfix Documentation
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