SSL_accept error from: Connection timed out

[Andre]

Hallo,

ein Kunde beschwert sich, dass er Mails über smtp auth sehr oft nur nach
mehreren Versuchen versendet bekommt. Dabei sieht der Debug-Log etwa so aus:

2019-05-24T05:31:50+02:00 connect from clienthost[XX.XXX.XX.XX]
2019-05-24T05:31:50+02:00 smtp_stream_setup: maxtime=10 enable_deadline=1
2019-05-24T05:31:50+02:00 auto_clnt_open: connected to private/tlsmgr
2019-05-24T05:31:50+02:00 send attr request = seed
2019-05-24T05:31:50+02:00 send attr size = 32
2019-05-24T05:31:50+02:00 private/tlsmgr: wanted attribute: status
2019-05-24T05:31:50+02:00 input attribute name: status
2019-05-24T05:31:50+02:00 input attribute value: 0
2019-05-24T05:31:50+02:00 private/tlsmgr: wanted attribute: seed
2019-05-24T05:31:50+02:00 input attribute name: seed
2019-05-24T05:31:50+02:00 input attribute value:
z+kyNjdUi7HoxJCIGPJVRy4nCC40UWWBu/q4XtSU9PI=
2019-05-24T05:31:50+02:00 private/tlsmgr: wanted attribute: (list
terminator)
2019-05-24T05:31:50+02:00 input attribute name: (end)
2019-05-24T05:32:00+02:00 SSL_accept error from
clienthost[XX.XXX.XX.XX]: Connection timed out
2019-05-24T05:32:00+02:00 match_hostname:
smtpd_client_event_limit_exceptions: clienthost ~? [fd00::]/64
2019-05-24T05:32:00+02:00 match_hostaddr:
smtpd_client_event_limit_exceptions: XX.XXX.XX.XX ~? [fd00::]/64
2019-05-24T05:32:00+02:00 match_list_match: clienthost: no match
2019-05-24T05:32:00+02:00 match_list_match: XX.XXX.XX.XX: no match
2019-05-24T05:32:00+02:00 send attr request = disconnect
2019-05-24T05:32:00+02:00 send attr ident = smtps:XX.XXX.XX.XX
2019-05-24T05:32:00+02:00 private/anvil: wanted attribute: status
2019-05-24T05:32:00+02:00 input attribute name: status
2019-05-24T05:32:00+02:00 input attribute value: 0
2019-05-24T05:32:00+02:00 private/anvil: wanted attribute: (list terminator)
2019-05-24T05:32:00+02:00 input attribute name: (end)
2019-05-24T05:32:00+02:00 lost connection after CONNECT from
clienthost[XX.XXX.XX.XX]
2019-05-24T05:32:00+02:00 disconnect from clienthost[XX.XXX.XX.XX]
ehlo=1 auth=0/1 commands=1/2

# TLS parameters aus der main.cf

smtpd_enforce_tls = yes
smtpd_tls_security_level = encrypt
smtpd_tls_cert_file = /etc/postfix/cert.crt
smtpd_tls_key_file = /etc/postfix/cert.key
smtpd_tls_received_header = yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_security_level = none

Eine Idee wo man was nachschauen kann?

-- 
LG
Andre