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define ('SMART_HOST', 'smtp:mail.my-isp.com')dnl
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The SMART_HOST option is used to indicate a specific remote mail server that you want to have handle the relaying of your network messages. It can be an ISP mail server, as well as any mail server in a larger network. For a dial-up connection over a modem, you can use various configuration options to control your connection. The confMESSAGE_TIMEOUT option lets you control how long mail can remain on the output queue, letting you keep mail until you are ready to dial in and send it. Setting the confDELIVERY_MODE option to queueonly lets you send mail when you are ready.
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The mailer table lets you route messages addressed to a specified host or domain to a particular mail server. You can use the mailer table to have mail addressed to a virtual domain routed to the mail server for your network. To reference an entire domain, prefix the domain name with a period. The host to which the mail is routed is prefixed by the mailer used, usually smtp for Sendmail. The following entry will route mail addressed to .mybeach.com to the mail server turtle.mytrek.com:
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.mybeach.com smtp:turtle.mytrek.com
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Entries are placed in the /etc/mail/mailertable file. Once you have made your entries, generate the mailertable.db database file with the make command:
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As seen in 25, you can define virtual domains for your network. These virtual domains are mapped to one or more real domains by your DNS server. However, you could receive messages with mail addresses for users on your virtual domains. In this case, you would need to map these addresses to users on your real domain so that the mail could be
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delivered to an existing location. This mapping is carried out by the virtual user table called /etc/mail/virtusertable. The virtual user table lets you map mail addresses for virtual domains to users on real domains. Within a virtual domain, you will have virtual hosts, which will operate off of real hosts on your network. For example, you may have two DNS names for the same host, one real and one virtual. Then, your host operating as your mail server may also have a virtual hostname by which it can be referenced. Such alternate names should be entered in the local-hostname file. A mail server supporting a virtual domain will have an alternate name consisting of the virtual domain name. Virtual domains are designated in your DNS configuration, as discussed in 25. For such a virtual domain, you will need an MX record to specify which real mail server will handle mail for that virtual domain. Make sure there is an MX record connecting your mail server with your virtual host in the DNS zone file for your network. In the following example, the virtual domain mybeach.com will have its mail handled by the mail server turtle.mytrek.com:
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mybeach.com. IN MX 10 turtle.mytrek.com.
Once your mail server for the virtual domain and any alternate names the server may have are specified, you then need to configure your virtual user table. The virtual user table file is specified in the sendmail.mc configuration file with the following entry:
FEATURE(`virtusertable', `dbm /etc/mail/virtusertable')dnl
In the /etc/mail directory you will find two versions of the virtusertable file, virtusertable and virtusertable.db. The virtusertable file is an editable text version where you enter your virtual host information. The virtusertable.db file is a database version of the text file that can be read by Sendmail. You first edit the virtusertable file, making your entries. Then you use it to generate the virtusertable.db version that can be used by Sendmail:
make virtusertable
An entry in the virtusertable file consists of a virtual address followed by the real address it is mapped to. In the following example, the users dylan and christopher at the virtual domain mybeach.com are mapped to their actual users on real hosts. dylan@mybeach.com is mapped to dylan@turtle.mytrek.com, and christopher@mybeach.com is mapped to chris@rabbit.mytrek.com:
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