On 04.09.24 01:05, gilles@poolp.org wrote:
> 
> Can you provide me with an example where I can't decide submission or transfer on
> that setup based on authentication ?
> 

When there is no authentication taking place and the mail is send to the
same domain. Something like:

From: someone@very-big-email-provider-with-millions-of-users
To: someone-else@very-big-email-provider-with-millions-of-users

As long as that provider does not require authentication. See attachment.

-- 
Christian
Script started on Wed Sep  4 01:28:51 2024
x500$ telnet vps.schulte.it 25
Trying 207.180.199.82...
Connected to vps.schulte.it.
Escape character is '^]'.
220 vps.schulte.it ESMTP Sendmail 8.17.1.9/8.17.1.9/Debian-2+deb12u2; Wed, 4 Sep 2024 01:28:57 +0200; (No UCE/UBE) logging access from: [87.122.16.197](FAIL)-[87.122.16.197]
HELO windows-oem
250 vps.schulte.it Hello [87.122.16.197], pleased to meet you
MAIL FROM:cs@schulte.it
250 2.1.0 cs@schulte.it... Sender ok
RCPT TO:hostmaster@schulte.it
250 2.1.5 hostmaster@schulte.it... Recipient ok
DATA
354 End data with <CR><LF>.<CR><LF>
Message-Id: <fucked-up>

Body.

.
250 2.0.0 483NSvJY050967 Message accepted for delivery

500 5.5.1 Command unrecognized: ""
quit
221 2.0.0 vps.schulte.it closing connection
Connection closed by foreign host.
x500$ ^D

Script done on Wed Sep  4 01:30:29 2024

• typescript (877B)