* Ralph Seichter via dovecot schrieb am 06.09.23 um 22:43 Uhr:
> Hello,
> 
> I cannot seem to send STARTTLS protected mail to talvi.dovecot.org, and
> I was wondering if anybody else sees similar problems:
> 
> Sep  6 22:29:10 ra postfix/smtp[15748]: SSL_connect error to 
> talvi.dovecot.org[94.237.105.223]:25: -1
> Sep  6 22:29:10 ra postfix/smtp[15748]: warning: TLS library problem: 
> error:0A000417:SSL routines::sslv3 alert illegal 
> parameter:../openssl-3.0.9/ssl/record/rec_layer_s3.c:1586:SSL alert number 47:
> Sep  6 22:29:10 ra postfix/smtp[15748]: 1AAE4BE0031: Cannot start TLS: 
> handshake failure
> Sep  6 22:29:10 ra postfix/smtp[15748]: SSL_connect error to 
> talvi.dovecot.org[2a04:3545:1000:720:acc1:5bff:fe5e:459]:25: -1
> Sep  6 22:29:10 ra postfix/smtp[15748]: warning: TLS library problem: 
> error:0A000417:SSL routines::sslv3 alert illegal 
> parameter:../openssl-3.0.9/ssl/record/rec_layer_s3.c:1586:SSL alert number 47:
> Sep  6 22:29:10 ra postfix/smtp[15748]: 1AAE4BE0031: 
> to=<dovecot@dovecot.org>, 
> relay=talvi.dovecot.org[2a04:3545:1000:720:acc1:5bff:fe5e:459]:25, delay=1.6, 
> delays=0.02/0.01/1.6/0, dsn=4.7.5, status=deferred (Cannot start TLS: 
> handshake failure)
> Sep  6 22:30:05 ra postfix/smtpd[15616]: timeout after END-OF-MESSAGE from 
> localhost[127.0.0.1]
> Sep  6 22:30:05 ra postfix/smtpd[15616]: disconnect from localhost[127.0.0.1] 
> ehlo=1 xforward=1 mail=1 rcpt=1 data=1 commands=5
> 
> The originating server uses Postfix 3.8.2 and OpenSSL library
> 3.0.9. To be able to send messages to dovecot.org at all, I had to use
> Postfix's "smtp_tls_policy_maps" setting to explicitly disable TLS for
> this destination domain.

Your openssl-3.0.9 (I suppose gentoo stable?) will not allow TLSv1 or 
sslv3 connections bei default anymore.

Wild guess: you need to explicitely allow for example DEFAULT@SECLEVEL=0 
ciphersuite in postfix to make *your* openssl accept this remote sslv3 
connection

Cheers
-Marc

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