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73416ba
(Get the code!)
There is a reference to a similar issue, of uo=%d,... resulting in uo=,... here:
https:/
https:/
The latter suggests there are some search modes (e.g. -A) where there isn't a domain defined for a user, since the search acts on multiple users. You didn't specify how you're using the search base you referenced, so not sure whether this is relevant for your case. If what's discussed in that mail thread doesn't match your use case, I would suggest raising your question on that Dovecot upstream mailing list; they will know what is going on better than us. Also, if the behavior is not a bug, then you might suggest where you had looked in the docs, since that place is probably where a mention should be made. If you raise this discussion there, please include a link on this bug report so we can follow up. If the discussion results in patches they may be worth considering SRUing them to 18.04.