Andrea skrev den 2014-01-16 17:36:

I had many mails "rejected" with a 450 code for "Sender address
rejected: Domain not found", and wanted to change them to a 550 code
to avoid queue on the previous mta.

dig +trace datasolutions.pe

where is dns failing ?

postfix softfails if it cant confirm it is not successfull find the domain in question, so if you sure cant find it either, you next step would be to make it rejected, not with a code change from softfails but with a sender domain reject, if you make hardfails on all domains then it will be hard to find why later

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