[Bug 3178] New: unknown expansion operator "domain_data" ("domain" does not take an _arg (change in behaviour)

https://bugs.exim.org/show_bug.cgi?id=3178

            Bug ID: 3178
           Summary: unknown expansion operator "domain_data" ("domain"
                    does not take an _arg (change in behaviour)
           Product: Exim
           Version: 4.99
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: bug
          Priority: medium
         Component: Transports
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]

I'm using Exim 4.99 from Fedora EPEL (on Rocky Linux 8), which was made
available in the last 24 hours.

Immediately upon upgrade, I started get deferred mails, with the following
error being repeatedly logged:

2025-11-14 06:12:24 1vJcRB-0000000BnXb-1VR7 == xxx.example.com
<[email protected]> R=lookuphost T=remote_smtp defer (-1): failed to expand
"interface" option for remote_smtp transport: unknown expansion operator
"domain_data" ("domain" does not take an _arg)

In my remote_smtp transport (driver is smtp), the "interface" option looks like
this:

interface = <;
${lookup{${domain_data:$sender_address}}lsearch*{/etc/exim/outgoing-interfaces}}
; MY_EXT_SECOND_6IP ; MY_EXT_6IP

Apparently this is now invalid, but there is no mention of breaking changes in
4.99 in https://github.com/Exim/exim/blob/master/src/README.UPDATING , and in
the changelog for 4.99 I wasn't able to identify why this has happened.

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