https://bugs.exim.org/show_bug.cgi?id=2604
--- Comment #4 from davidc <david-exim-bugs@???> ---
With recipient verification removed and only the cutthrough accept line
present:
>From sender to inbound relay:
<< 220 smtpin001.a.snlmail.net ESMTP
>> ehlo asd
<< 250-smtpin001.a.snlmail.net Hello sarlonintman001.sargasso.net.uk
[2a05:e200:0:1::1]
<< 250-SIZE 52428800
<< 250-8BITMIME
<< 250-PIPELINING
<< 250-CHUNKING
<< 250-STARTTLS
<< 250 HELP
>> mail from:<me@???>
<< 250 OK
>> rcpt to:<invalid@???>
<< 550 Administrative prohibition
>> quit
<< 221 smtpin001.a.snlmail.net closing connection
>From inbound relay to mailstore host:
<< 220 mailstore001.a.snlmail.net ESMTP
>> EHLO smtpin001.a.snlmail.net
<< 250-mailstore001.a.snlmail.net Hello smtpin001.a.snlmail.net
[2a05:e200:1:74::2:1]
<< 250-SIZE 52428800
<< 250-8BITMIME
<< 250-PIPELINING
<< 250-CHUNKING
<< 250 HELP
>> MAIL FROM:<me@???>
>> RCPT TO:<invalid@???>
<< 250 OK
<< 550 Address invalid@??? unknown.
>> QUIT
<< 221 mailstore001.a.snlmail.net closing connection
So the sender just gets "550 Administrative prohibition"; even if
smtp_return_error_details is turned on at the inbound relay, it is hiding the
error.
Whereas when recipient verification is used, they get 550-Callout verification
failed:" "550 550 Address invalid@??? unknown.".
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