domain
Normally, lookups of hosts in the access database are literal. That is, host.domain is
looked up first as host.domain and then as domain. If you declare the
FEATURE(lookupdotdomain)* (?§17.8.26 on page 628) or add a literal lookupdotdomain
fourthargument (?§7.5.1 on page 277) to the FEATURE(access_db)??™s declaration, you
cause the sequence to become host.domain, then .domain, and lastly domain. This
feature allows you to structure an access database to handle the domain differently
than it handles hosts in the domain:
From:.domain REJECT
From:domain OK
Here, envelope senders witha host part of @anything.domain will be rejected, but
those with a host part of @domain will be accepted. To illustrate, consider the following
attempt to accept mail only from cs.Berkeley.EDU and to reject mail from
hosts in that subdomain:
From:.cs.Berkeley.EDU REJECT
From:cs.Berkeley.EDU OK
7.5.9 Choose Queue Groups Via the access Database
Beginning withV8.12, it is possible to select queue groups using the access database
by declaring the FEATURE(queuegroup). Queue groups and the FEATURE(queuegroup)
are discussed in detail in ?§11.4 on page 408.
7.5.10 Screen Based on STARTTLS and AUTH=
Beginning withV8.12, it is possible to accept, reject, and allow relaying based on the
STARTTLS and AUTH= SMTP extensions. These abilities, and the features that support
them, are detailed in Chapter 5 on page 183.
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