On Wed, Jun 18, 2025 at 10:13:21AM -0400, Wietse Venema via Postfix-users wrote:
> > After setting "postscreen_tls_security_level = none", when I now send a
> > STARTTLS, I get a "502 5.5.1 Error: command not implemented", and then
> > /the SMTP session/ stops responding to any subsequent commands, /until
> > the client disconnects or the postscreen_command_time_limit is reached/.
> > /(Postscreen itself remains operational for processing other connections.)/
>
> Does not reproduce. Here is evidence.
>
> $ postconf -n|grep '^postscreen'
> postscreen_bare_newline_enable = yes
> ...
> postscreen_tls_security_level = none
>
> $ telnet wzv smtp
> Trying 168.100.3.7...
> Connected to wzv.
> Escape character is '^]'.
> 220-wzv.porcupine.org ESMTP Postfix
> ...delay...
> 220 wzv.porcupine.org ESMTP Postfix
> ehlo wzv.porcupine.org
> 250-wzv.porcupine.org
> 250-SIZE 10240000
> 250-VRFY
> 250-ETRN
> 250-ENHANCEDSTATUSCODES
> 250-8BITMIME
> 250-DSN
> 250-SMTPUTF8
> 250 CHUNKING
> starttls
> 502 5.5.1 Error: command not implemented
> quit
> 221 2.0.0 Bye
Ditto for me:
$ (sleep 7; printf "EHLO foo.local\r\n"; sleep 2; printf "STARTTLS\r\n";
sleep 2; printf "QUIT\r\n") | nc -C 127.0.0.1 24
220-amnesiac.example ESMTP Postfix
<...6s pause...>
220 amnesiac.example ESMTP Postfix
250-amnesiac.example
250-SIZE 157286400
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250-SMTPUTF8
250 CHUNKING
502 5.5.1 Error: command not implemented
221 2.0.0 Bye
The relevant master.cf entries are:
127.0.0.1:24 inet n - n - 1 postscreen
-o myhostname=amnesiac.example
-o postscreen_bare_newline_enable=yes
-o postscreen_greet_action=enforce
-o postscreen_pipelining_enable=yes
-o postscreen_access_list=
-o postscreen_allowlist_interfaces=
-o smtpd_tls_security_level=none
smtpd pass - - n - - smtpd
-o smtpd_tls_security_level=none
dnsblog unix - - n - 0 dnsblog
#tlsproxy unix - - n - 0 tlsproxy
I doubt it matters, but I'm running 3.11-20250606, not 3.9.
--
Viktor.
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