The qmail Handbook

qmail includes the following features for routing messages by domain name:

• Unlimited names for local host. The local system can have any number of aliases.

• Unlimited virtual domains. One host can support any number of virtual domains-each with a separate name space.

• Domain wildcards. Using the virtual domains support, domains can be wildcard matched for special routing.

• Configurable "percent hack" support. Sendmail-style routed addresses-for example, molly%example.com@example.net-can be supported.