On 2025/08/12 2:25 PM, Frank Richter via Exim-users wrote:
But if recipient’s domain doesn’t exist, exim gives a temp error:
451 Temporary local problem

What did DNS actually return for that domain?   Use debug.

I realise this doesn't answer your question, but I fear that
the "fix" you are thinking of would introduce a problem in
the other direction.

What you're asking for is probably possible, but would require
some rather low-level detail work in your config, essentially
replacing what that "checkonly" router does.  Start with looking
into the "dnslookup" lookup type, think about replacing your
existing "verify=recipient", and worry about all the possible return
value that this lookup might give.
--
Cheers,
  Jeremy

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