7 sendmail, addresses with and without a host part that resolve to local
delivery are handled in the same way. For example, user and user@local.host are both
looked up with the User Database (?§23.7.27 on page 942) and processed by the localaddr
rule set 5 (?§19.6 on page 700). This processing can result in those addresses being
forwarded to other machines.
With FEATURE(stickyhost), you can change this behavior:
FEATURE(`stickyhost??)
By defining stickyhost, you are telling sendmail to mark addresses that have a local host
part as ???sticky???:
user ?†? not sticky
user@local.host ?†? sticky
Sticky hosts tend to be delivered on the local machine. That is, they are not looked up with
the User Database and are not processed by the localaddr rule set 5.
One use for this feature is to create a domain-wide namespace. In it, all addresses without a
host part will be forwarded to a central mail server. Those with a local host part will remain
on the local machine and be delivered in the usual local way.
Note that this is opposite the behavior of the former FEATURE(notsticky) of V8.6.
This is the Title of the Book, eMatter Edition
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17.8 Configuration File Feature Reference | 643
17.8.54 FEATURE(use_client_ptr)
Replace IP address with ${client_ptr} in check_relay V8.
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