Книга: Linux Network Administrator Guide, Second Edition

Forwarding virtual-hosted mail to other destinations

Forwarding virtual-hosted mail to other destinations

The sendmail virtusertable feature configures support for the virtual user table, where we configure virtual email hosting. The virtual user table maps incoming mail destined for some user@host to some otheruser@otherhost. You can think of this as an advanced mail alias feature, one that operates using not just the destination user, but also the destination domain.

To configure the virtusertable feature, add the feature to your sendmail.mc configuration as shown:

FEATURE(virtusertable)

By default, the file containing the rules to perform translations will be /etc/mail/virtusertable. You can override this by supplying an argument to the macro definition; consult a detailed sendmail reference to learn about what options are available.

The format of the virtual user table is very simple. The lefthand side of each line contains a pattern representing the original destination mail address; the righthand side has a pattern representing the mail address the virtual hosted address will be mapped to.

The following example shows three possible types of entries:

[email protected]     colin
[email protected]      [email protected]
@dairy.org            [email protected]
@artist.org           [email protected]

In this example, we are virtual hosting three domains: bovine.net, dairy.org, and artist.org.

The first entry redirects mail sent to a user in the bovine.net virtual domain to a local user on the machine. The second entry redirects mail to a user in the same virtual domain to a user in another domain. The third example redirects all mail addressed to any user in the dairly.org virtual domain to a single remote mail address. Finally, the last entry redirects any mail to a user in the artist.org virtual domain to the same user in another domain; for example, [email protected] would be redirected to [email protected].

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