es hatte 13 zeichen - groß und kein mit zahlen und 2 sonderzeichen.
ja fail2ban ist am laufen
hab ebend nochmal die mail logs nach der Ip durchsucht.
Oct 26 14:22:00 panel postfix/smtpd[20643]: warning: hostname b3da458e.virtua.com.br does not resolve to address 179.218.69.142: Name or service not knownOct 26 14:22:00 panel postfix/smtpd[20643]: connect from unknown[179.218.69.142]Oct 26 14:22:04 panel postfix/smtpd[20643]: 4DA114CA06A: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:22:23 panel postfix/smtpd[20643]: 26FA44C7C12: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:22:34 panel postfix/smtpd[20643]: E0F3D4CB0EA: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:22:47 panel postfix/smtpd[20643]: 44A834C8D69: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:23:01 panel postfix/smtpd[20643]: A99644CB178: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:23:18 panel postfix/smtpd[20643]: E4D8E4CB132: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:23:36 panel postfix/smtpd[20643]: 3FEA54CB260: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:23:51 panel postfix/smtpd[20643]: 63F4F4CB2A3: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:24:05 panel postfix/smtpd[20643]: 24D614CB308: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:24:22 panel postfix/smtpd[20643]: 993D14CB376: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:24:38 panel postfix/smtpd[20643]: 3065E4CB3EC: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:24:53 panel postfix/smtpd[20643]: E19C74C8C7D: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:25:04 panel postfix/smtpd[20643]: 84F084CB454: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:25:22 panel postfix/smtpd[20643]: DEA694CB493: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:25:35 panel postfix/smtpd[20643]: D7BB44C811A: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:25:48 panel postfix/smtpd[20643]: CFBA34CA1BC: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:26:03 panel postfix/smtpd[20643]: 6E4C74CB57D: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:26:12 panel postfix/smtpd[20643]: 65F0C4CB5B8: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:26:26 panel postfix/smtpd[20643]: C80334CB626: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:26:36 panel postfix/smtpd[20643]: 82C0A4CB652: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:26:50 panel postfix/smtpd[20643]: EE3FA4CB665: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:27:04 panel postfix/smtpd[20643]: 8E2284CB6EF: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:27:24 panel postfix/smtpd[20643]: 8A0084CB715: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:27:35 panel postfix/smtpd[20643]: 9E98E4CB7A2: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:27:48 panel postfix/smtpd[20643]: 915DD4CA43A: client=unknown[179.218.69.142], sasl_method=PLAIN, sasl_username=support@bigone1.netOct 26 14:27:49 panel postfix/smtpd[20643]: 915DD4CA43A: reject: RCPT from unknown[179.218.69.142]: 450 4.1.2 <network@bullesdozer.com>: Recipient address rejected: Domain not found; from=<support@bigone1.net> to=<network@bullesdozer.com> proto=ESMTP helo=<[127.0.0.1]>Oct 26 14:27:49 panel postfix/smtpd[20643]: too many errors after RCPT from unknown[179.218.69.142]Oct 26 14:27:49 panel postfix/smtpd[20643]: disconnect from unknown[179.218.69.142]
sonst taucht die IP nirgenswo anders in den Logs auf