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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