Hi, all,
I'm having trouble with one client (iot) not able to send emails via
postfix. This is the log:
postfix/smtps/smtpd[4420]: initializing the server-side TLS engine
postfix/smtps/smtpd[4420]: connect from unknown[xxx.xxx.xxx.xxx]
postfix/smtps/smtpd[4420]: setting up TLS connection from
unknown[xxx.xxx.xxx.xxx]
postfix/smtps/smtpd[4420]: unknown[xxx.xxx.xxx.xxx]: TLS cipher list
"aNULL:-aNULL:HIGH:@STRENGTH"
postfix/smtps/smtpd[4420]: SSL_accept:before SSL initialization
postfix/smtps/smtpd[4420]: SSL3 alert write:fatal:decode error
postfix/smtps/smtpd[4420]: SSL_accept:error in error
postfix/smtps/smtpd[4420]: SSL_accept error from unknown[xxx.xxx.xxx.xxx]:
-1
postfix/smtps/smtpd[4420]: warning: TLS library problem: error:0A000126:SSL
routines::unexpected eof while reading:../ssl/record/rec_layer_s3.c:308:
postfix/smtps/smtpd[4420]: lost connection after CONNECT from
unknown[xxx.xxx.xxx.xxx]
postfix/smtps/smtpd[4420]: disconnect from unknown[xxx.xxx.xxx.xxx]
commands=0/0
I've seen www.mail-archive.com/postfix-users@postfix.org/msg96175.html, but
it didn't help.
Extract of mainf.cf:
smtpd_tls_session_cache_database =
smtp_tls_session_cache_database =
smtp_tls_security_level = may
smtpd_tls_security_level = may
smtpd_tls_mandatory_protocols = !SSLv2,!SSLv3,!TLSv1
smtp_tls_mandatory_protocols = !SSLv2,!SSLv3,!TLSv1
smtpd_tls_protocols = !SSLv2,!SSLv3,!TLSv1
smtp_tls_protocols = !SSLv2,!SSLv3,!TLSv1
smtpd_tls_mandatory_ciphers=high
smtpd_use_tls=yes
Wireshark is showing:
Transport Layer Security
TLSv1.2 Record Layer: Alert (Level: Fatal, Description: Decode Error)
Content Type: Alert (21)
Version: TLS 1.2 (0x0303)
Length: 2
Alert Message
Level: Fatal (2)
Description: Decode Error (50)
Ubuntu 22.04.1
Postfix version: 3.6.4
Dovecot version: 2.3.16
Any ideas how to solve this?
smime.p7s
Description: S/MIME cryptographic signature
