New ClientPortOptions Option (System Administration Guide: Resource Management and Network Services)

System Administration Guide: Resource Management and Network Services

New `ClientPortOptions` Option

The new ClientPortOptions option is for outgoing connections and is similar to the DaemonPortOptions option. This option sets the client SMTP options, which are a sequence of key=value pairs. To declare this option, use one of the following syntaxes. For formatting purposes, the example includes two pairs. However, you can apply one or more pairs.

O ClientPortOptions=pair,pair              # for the configuration file
-OClientPortOptions=pair,pair              # for the command line
define(`confCLIENT_OPTIONS',`pair,pair')   # for m4 configuration

If you need to build a new sendmail.cf file, refer to "Building the sendmail.cf Configuration File (Task)" in Chapter 25, Mail Services (Tasks).

The following table describes the new keys for this option.

Table 27-4 New Keys for ClientPortOptions


Key	Description
`Addr`	Specifies the address mask. The value can be a numeric address in dot notation or a network name. If the pair is omitted, the default is `INADDR_ANY`, which accepts connections from any network.
`Family`	Specifies the address family. The key's default is `inet` for `AF_INET`. Other values are `inet6` for `AF_INET6`, `iso` for `AF_ISO`, `ns` for `AF_NS`, and `x.25` for `AF_CCITT`.
`Listen`	Specifies the size of the listen queue. The key defaults to `10`. You should not have to change this default for the Solaris operating environment.
`Port`	Specifies the name and number of the listening port. The key defaults to `smtp`.
`RcvBufSize`	Specifies the size of the TCP/IP send buffer. The key has no default value, which means that no size specifications are automatically made. If the option is set to a value greater than zero, that value is used. You should not have to limit the size of this buffer for the Solaris operating environment.
`Modifier`	Specifies flags for `sendmail`: The `h` flag uses the name that corresponds to the outgoing interface address for the `HELO` or `EHLO` commands, whether it was chosen by the connection parameter or by the default. The `A` flag disables `AUTH`. This flag can also be used with the `Modifier` key for `DaemonPortOptions`. Refer to "Changes to `DaemonPortOptions` Option". The `S` flag turns off the use of or the offer to use `STARTTLS` when email is being delivered or received.