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# smtp_return_error_details and sender verify defer need_ipv4 # exim -bs helo test mail from:<x@host.test.again.dns> rcpt to:<x@y> rcpt to:<a@b> quit **** exim -DRETURN_ERROR_DETAILS=true -bs helo test mail from:<x@host.test.again.dns> rcpt to:<x@y> rcpt to:<a@b> quit ****