[exim-dev] [Bug 1685] New: interface_strict

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Nowe tematy: [exim-dev] [Bug 1685] interface_strict
Temat: [exim-dev] [Bug 1685] New: interface_strict
https://bugs.exim.org/show_bug.cgi?id=1685

            Bug ID: 1685
           Summary: interface_strict
           Product: Exim
           Version: N/A
          Hardware: All
                OS: All
            Status: NEW
          Severity: wishlist
          Priority: medium
         Component: Transports
          Assignee: nigel@???
          Reporter: outsider@???
                CC: exim-dev@???


interface_strict     Use: smtp     Type: string list     Default: unset


This option specifies which interface to bind to when making an outgoing SMTP
call. The value is an IP address, not an interface name such as eth0. Do not
confuse this with the interface address that was used when a message was
received, which is in $received_ip_address, formerly known as
$interface_address. The name was changed to minimize confusion with the
outgoing interface address. There is no variable that contains an outgoing
interface address because, unless it is set by this option, its value is
unknown.

During the expansion of the interface option the variables $host and
$host_address refer to the host to which a connection is about to be made
during the expansion of the string. Forced expansion failure, or an empty
string result causes the option to be ignored. Otherwise, after expansion, the
string must be a list of IP addresses, colon-separated by default, but the
separator can be changed in the usual way. For example:

interface = <; 192.168.123.123 ; 3ffe:ffff:836f::fe86:a061

The first interface of the correct type (IPv4 or IPv6) is used for the outgoing
connection. If none of them are the correct type, the option is ignored. If
interface is not set, or is ignored the transport should fail and exim should
treat the connection as failed. This should force exim to only use the specific
ips and not pick any other random available in that type.

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