Und hier nun der relevante Teil von /var/log/mail.info:
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Sep 2 20:48:44 hyperbrain postfix/smtps/smtpd[20498]: connect from dynamic-077-004-111-244.77.4.pool.telefonica.de[77.4.111.244]
Sep 2 20:48:45 hyperbrain postfix/smtps/smtpd[20498]: TLS SNI hyperbrain.hahnefeld.it from dynamic-077-004-111-244.77.4.pool.telefonica.de[77.4.111.244] not matched, using default chain
Sep 2 20:49:01 hyperbrain postfix/smtps/smtpd[20498]: B027C1062927: client=dynamic-077-004-111-244.77.4.pool.telefonica.de[77.4.111.244], sasl_method=LOGIN, sasl_username=
info@goldene-zeiten.info
Sep 2 20:49:01 hyperbrain postsrsd[20505]: srs_forward: <
regensburg@goldene-zeiten.info> rewritten as <SRS0=pySb=ZF=goldene-zeiten.info=
regensburg@hahnefeld.it>
Sep 2 20:49:01 hyperbrain postfix/smtps/smtpd[20498]: B027C1062927: reject: RCPT from dynamic-077-004-111-244.77.4.pool.telefonica.de[77.4.111.244]: 550 5.1.1 <de>: Recipient address rejected: User unknown in local recipient table; from=<
regensburg@goldene-zeiten.info> to=<de> proto=ESMTP helo=<goldene-zeiten.info>
Sep 2 20:49:02 hyperbrain postfix/smtps/smtpd[20498]: lost connection after RCPT from dynamic-077-004-111-244.77.4.pool.telefonica.de[77.4.111.244]
Sep 2 20:49:02 hyperbrain postfix/smtps/smtpd[20498]: disconnect from dynamic-077-004-111-244.77.4.pool.telefonica.de[77.4.111.244] ehlo=1 auth=1 mail=1 rcpt=1/2 commands=4/5
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Wenn ich auf den Standard 1.2 zurückstelle (was mir natürlich auch lieber wäre), dann deutet alles darauf hin, dass die Kommunikation platzt:
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Sep 2 20:56:46 hyperbrain postfix/smtps/smtpd[21920]: SSL_accept error from dynamic-077-004-111-244.77.4.pool.telefonica.de[77.4.111.244]: -1
Sep 2 20:56:46 hyperbrain postfix/smtps/smtpd[21920]: warning: TLS library problem: error:14209102:SSL routines:tls_early_post_process_client_hello:unsupported protocol:../ssl/statem/statem_srvr.c:1685:
Sep 2 20:56:46 hyperbrain postfix/smtps/smtpd[21920]: lost connection after CONNECT from dynamic-077-004-111-244.77.4.pool.telefonica.de[77.4.111.244]
Sep 2 20:56:46 hyperbrain postfix/smtps/smtpd[21920]: disconnect from dynamic-077-004-111-244.77.4.pool.telefonica.de[77.4.111.244] commands=0/0
Sep 2 20:57:07 hyperbrain postfix/smtps/smtpd[21920]: connect from dynamic-077-004-111-244.77.4.pool.telefonica.de[77.4.111.244]
Sep 2 20:57:08 hyperbrain postfix/smtps/smtpd[21920]: SSL_accept error from dynamic-077-004-111-244.77.4.pool.telefonica.de[77.4.111.244]: -1
Sep 2 20:57:08 hyperbrain postfix/smtps/smtpd[21920]: warning: TLS library problem: error:14209102:SSL routines:tls_early_post_process_client_hello:unsupported protocol:../ssl/statem/statem_srvr.c:1685:
Sep 2 20:57:08 hyperbrain postfix/smtps/smtpd[21920]: lost connection after CONNECT from dynamic-077-004-111-244.77.4.pool.telefonica.de[77.4.111.244]
Sep 2 20:57:08 hyperbrain postfix/smtps/smtpd[21920]: disconnect from dynamic-077-004-111-244.77.4.pool.telefonica.de[77.4.111.244] commands=0/0
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Also mit der TLS-Geschichte scheinen wir zumindest nah dran zu sein...