Re: verify recipient - temp error instead of perm error

  Hi.
  
On Tue, Aug 12, 2025 at 03:25:03PM +0200, Frank Richter via Exim-users wrote:
> in an acl_smtp_rcpt I’d like to deny if recipient’s domain doesn’t exist:
...
> I’ve a setup with some manualroute routers only, like
> 
> smarthost:
>   driver = manualroute
>   domains = !+local_domains
>   route_list = * smarthost.domain bydns
>   transport = smtp
>   verify = false
...
> This works so far. But if recipient’s domain doesn’t exist, exim gives a
> temp error:
> 451 Temporary local problem

 If you are using manualroute driver with "bydns", you can't exclude
 situations of temporaty DNS failure for valid and existing domains,
 including "ServFail" answer.
 
> How can I achieve that exim gives a '550 Unrouteable address'?

 You should NOT reject mails with 550 status on temporary DNS failures
 unless you consider occasional rejects/bounces as acceptable situation.
-- 
 Eugene Berdnikov

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