Multiple RHS mailertable entries
It is possible to specify a colon-separated list of MX records, hosts, or IP addresses in the right-hand side (RHS) of the sendmail mailertable database to create "private" MX records. Each MX record, host, or IP address is tried in left-to-right order.
This behavior is documented in doc/op/op.*:
5.1.2. The right hand side
If the mailer is the built-in IPC mailer, the host may be a colon-separated list of hosts that are searched in order for the ﬁrst working address (exactly like MX records).
5.1.5. IPC mailers
The host name passed in after the “$@” may also be a
colon-separated list of hosts. Each is separately MX expanded and the results are concatenated to make (essentially) one long MX list. The intent here is to create “fake” MX records that are not published in DNS for private internal networks.
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Last modified: 2006/11/27