168.23.45 2
ClientRate:127.0.0.1 0
ClientRate: 10
ClientRate:10.5.2 2
ClientRate:IPv6:2002:c0a8:51d2::23f4 5
Here, the first line (as you have seen) limits the number of simultaneous connections from
the IP address 192.168.23.45 to no more than two.
In the second line, which specifies zero, the zero means that there is no limit imposed on
the overall number of simultaneous connections. This is suitable for the loopback interface
address (127.0.0.1) because that is where the local submission version of sendmail delivers
its mail.
The third line omits the IP address entirely, thereby setting the default limit for all other IP
(unspecified) addresses.
The fourth line shows how network addresses may also be limited.
The last line shows that IPv6 addresses may be specified merely by prefixing each with a
literal IPv6:.
Note that the limits we show here are just examples, not recommendations. The limits you
choose will depend on your particular circumstances.
17.8.13.1 conncontrol and delay checks
If you also declare FEATURE(delay_checks) (?§7.5.6 on page 284), connection control checks
will be delayed until after the first envelope recipient has been received. Clearly this makes
this connection check less useful than it should be. If you use delay_checks, you may add
an additional argument to this FEATURE(conncontrol) to get it to run as early as possible
despite the use of that delaying feature:
FEATURE(`conncontrol??, `nodelay??)
Here, the nodelay is literal and prevents FEATURE(delay_checks) from having any effect on
connection controls.
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