database was introduced in V8.9 sendmail, and
improved upon in V8.10. It provides a single, central database with
rules to accept, reject, and discard messages based on the sender
name, address, or IP number. It is enabled with the
access_db configuration feature.
For example, consider an access database with the following contents:
From:email@example.com OK From:spam.com REJECT
Here, mail from postmaster at the site spam.com is accepted, while mail from any other sender at that site is rejected.
Note that this example uses V8.10 syntax. Next we will describe the access database using the old V8.9 syntax, then describe the V8.10 and V8.12 updates.
To enable use of this access database, declare it in your mc configuration file like this:
This enables use of the access database, and enables the default database type and path as:
hash /etc/mail/access ← V8.11 and earlier hash -T<TMPF> /etc/mail/access← V8.12 and above
Note that with V8.12 and above a
has been added to specify that temporary errors should return a 4xy
If you wish to use a different database type or pathname, you can do
so by providing an appropriate argument to the
FEATURE(`access_db', `hash -o /etc/mail/access') ← V8.11 and earlier FEATURE(`access_db', `hash -o -T<TMPF> /etc/mail/access')← V8.12 and above
Here, we add the
-o switch (-o) to the definition to make the existence of
the /etc/mail/access ...