FAQ / Routing for local delivery / Q0431
Q0431
Question
How do I configure Exim to allow arbitrary extensions in local parts, of the form +extension?
Answer
Add this pre-condition to the relevant router:
local_part_suffix = +*
If you want the extensions to be optional, also add the option
local_part_suffix_optional
When the router runs, $local_part contains the local part with the extension removed, and the extension (if any) is in $local_part_suffix. If you have set check_local_user, the test is carried out after the extension is removed.
FAQ / Routing for local delivery / Q0431