Hello!
interface
Type: string list, expanded
Default: unset
This option specifies which interface to bind to when making an outgoing
SMTP call. 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
colon-separated list of IP addresses, for example:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Should read must be a
semicolon-separated list of IP addresses
interface = <; 192.168.123.123 ; 3ffe:ffff:836f::fe86:a061
Regardsm
Boris