🇩🇪
Paul Smith
2026-06-18 01:19:30
(2 hours ago)
Email Auth Brute force attack 5/2 in last day
Brute-Force
🇩🇪
icera-network.de
2026-06-18 00:30:07
(3 hours ago)
Jun 18 02:29:56 mail postfix/smtps/smtpd[1087832]: lost connection after AUTH from unknown[81.30.98. ...
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Jun 18 02:29:56 mail postfix/smtps/smtpd[1087832]: lost connection after AUTH from unknown[81.30.98.51]
Jun 18 02:29:56 mail postfix/smtps/smtpd[1087832]: disconnect from unknown[81.30.98.51] ehlo=1 auth=0/1 commands=1/2
Jun 18 02:30:06 mail postfix/smtps/smtpd[1087798]: warning: unknown[81.30.98.51]: SASL LOGIN authentication failed: (reason unavailable), [email protected]
Jun 18 02:30:06 mail postfix/smtps/smtpd[1087798]: lost connection after AUTH from unknown[81.30.98.51]
Jun 18 02:30:06 mail postfix/smtps/smtpd[1087798]: disconnect from unknown[81.30.98.51] ehlo=1 auth=0/1 commands=1/2
...
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Brute-Force
🇩🇪
LRob.fr
2026-06-18 00:30:06
(3 hours ago)
SMTP brute-force detected by Fail2Ban in plesk-postfix jail
Email Spam
Brute-Force
🇺🇸
bigscoots.com
2026-06-17 23:31:03
(4 hours ago)
(smtpauth) Failed SMTP AUTH login from 81.30.98.51 (LT/Lithuania/-): 5 in the last 3600 secs; Ports: ...
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(smtpauth) Failed SMTP AUTH login from 81.30.98.51 (LT/Lithuania/-): 5 in the last 3600 secs; Ports: 25,465,587; Direction: 0; Trigger: LF_SMTPAUTH; Logs: 2026-06-17 19:30:07 dovecot_login authenticator failed for H=(O3yt5zNY) [81.30.98.51]:21661: 535 Incorrect authentication data (set_id=info)
2026-06-17 19:30:14 dovecot_login authenticator failed for H=(t56Y1l) [81.30.98.51]:14933: 535 Incorrect authentication data (set_id=info)
2026-06-17 19:30:25 dovecot_login authenticator failed for H=(8MZwusMu) [81.30.98.51]:40995: 535 Incorrect authentication data ([email protected] )
2026-06-17 19:30:43 dovecot_login authenticator failed for H=(6HHSxwl) [81.30.98.51]:21235: 535 Incorrect authentication data ([email protected] )
2026-06-17 19:31:02 dovecot_login authenticator failed for H=(QNYsbsSFs) [81.30.98.51]:35596: 535 Incorrect authentication data (set_id=info)
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Brute-Force
SSH
2026-06-17 22:28:54
(5 hours ago)
SMTP AUTH 81.30.98.51 (SMTP_LOGIN_ATTEMPT)
Brute-Force
🇩🇪
ipcop.net
2026-06-17 22:03:59
(5 hours ago)
2026-06-17T23:03:50.241806+01:00 web01.schwick.de postfix/smtps/smtpd[3305289]: NOQUEUE: reject: RCP ...
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2026-06-17T23:03:50.241806+01:00 web01.schwick.de postfix/smtps/smtpd[3305289]: NOQUEUE: reject: RCPT from unknown[81.30.98.51]: 554 5.7.1 <unknown[81.30.98.51]>: Client host rejected: Access denied; from=<[email protected] > to=<[email protected] > proto=ESMTP helo=<bPIYuJlVju>
2026-06-17T23:03:52.088665+01:00 web01.schwick.de postfix/smtps/smtpd[3305289]: warning: unknown[81.30.98.51]: SASL LOGIN authentication failed: (reason unavailable), sasl_username=info
2026-06-17T23:03:52.119230+01:00 web01.schwick.de postfix/smtps/smtpd[3305289]: disconnect from unknown[81.30.98.51] ehlo=1 auth=0/1 commands=1/2
2026-06-17T23:03:58.426860+01:00 web01.schwick.de postfix/smtps/smtpd[3305289]: warning: unknown[81.30.98.51]: SASL LOGIN authentication failed: (reason unavailable), sasl_username=info
2026-06-17T23:03:58.458888+01:00 web01.schwick.de postfix/smtps/smtpd[3305289]: disconnect from unknown[81.30.98.51] ehlo=1 auth=0/1 commands=1/2
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Fraud VoIP
Brute-Force
2026-06-17 21:39:24
(5 hours ago)
Port scanning: unknown[81.30.98.51]
unknown[81.30.98.51]
unknown[81.30.98.51]
Brute-Force
🇩🇪
lenz
2026-06-17 18:55:05
(8 hours ago)
2026-06-17T20:52:32.094763+02:00 mail.lenzdevelopment.pl postfix/smtpd[2198008]: warning: unknown[81 ...
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2026-06-17T20:52:32.094763+02:00 mail.lenzdevelopment.pl postfix/smtpd[2198008]: warning: unknown[81.30.98.51]: SASL LOGIN authentication failed: UGFzc3dvcmQ6, [email protected]
2026-06-17T20:52:38.422305+02:00 mail.lenzdevelopment.pl postfix/smtpd[2198008]: warning: unknown[81.30.98.51]: SASL LOGIN authentication failed: UGFzc3dvcmQ6, [email protected]
2026-06-17T20:52:48.254728+02:00 mail.lenzdevelopment.pl postfix/smtpd[2198575]: warning: unknown[81.30.98.51]: SASL LOGIN authentication failed: UGFzc3dvcmQ6, [email protected]
2026-06-17T20:52:58.067451+02:00 mail.lenzdevelopment.pl postfix/smtpd[2198575]: warning: unknown[81.30.98.51]: SASL LOGIN authentication failed: UGFzc3dvcmQ6, [email protected]
2026-06-17T20:53:08.393099+02:00 mail.lenzdevelopment.pl postfix/smtpd[2198008]: warning: unknown[81.30.98.51]: SASL LOGIN authentication failed: Connection lost to authentication serv
...
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Brute-Force
🇺🇸
RHNoah
2026-06-17 18:30:29
(9 hours ago)
(smtpauth) Failed SMTP AUTH login from 81.30.98.51 (LT/-/-): 5 in the last 3600 secs; Ports: *; Dire ...
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(smtpauth) Failed SMTP AUTH login from 81.30.98.51 (LT/-/-): 5 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_SMTPAUTH; Logs: 2026-06-17 14:29:59 login authenticator failed for H=(BBonnj5tgs) [81.30.98.51]: 535 Incorrect authentication data (set_id=info)
2026-06-17 14:30:02 login authenticator failed for H=(8x2x8959) [81.30.98.51]: 535 Incorrect authentication data (set_id=info)
2026-06-17 14:30:20 login authenticator failed for H=(gfEcLG6mG) [81.30.98.51]: 535 Incorrect authentication data ([email protected] )
2026-06-17 14:30:23 login authenticator failed for H=(GJj7Z44) [81.30.98.51]: 535 Incorrect authentication data ([email protected] )
2026-06-17 14:30:27 login authenticator failed for H=(cC0Q5TtV) [81.30.98.51]: 535 Incorrect authentication data (set_id=info)
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Port Scan
🇫🇷
dwmp
2026-06-17 17:09:19
(10 hours ago)
Jun 17 19:09:18 webcore postfix/smtpd[1651251]: warning: unknown[81.30.98.51]: SASL LOGIN authentica ...
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Jun 17 19:09:18 webcore postfix/smtpd[1651251]: warning: unknown[81.30.98.51]: SASL LOGIN authentication failed: authentication failure
Jun 17 19:09:18 webcore postfix/smtpd[1651259]: warning: unknown[81.30.98.51]: SASL LOGIN authentication failed: authentication failure
Jun 17 19:09:19 webcore postfix/smtpd[1651251]: warning: unknown[81.30.98.51]: SASL LOGIN authentication failed: authentication failure
...
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Brute-Force
🇩🇪
Marc
2026-06-17 14:09:50
(13 hours ago)
2026-06-17T16:09:37.137964+02:00 mx1 postfix/smtps/smtpd[278933]: NOQUEUE: reject: RCPT from unknown ...
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2026-06-17T16:09:37.137964+02:00 mx1 postfix/smtps/smtpd[278933]: NOQUEUE: reject: RCPT from unknown[81.30.98.51]: 554 5.7.1 <unknown[81.30.98.51]>: Client host rejected: Access denied; from=<[email protected] > to=<[email protected] > proto=ESMTP helo=<93hbdMX9qL> 2026-06-17T16:09:37.154114+02:00 mx1 postfix/smtps/smtpd[276537]: NOQUEUE: reject: RCPT from unknown[81.30.98.51]: 554 5.7.1 <unknown[81.30.98.51]>: Client host rejected: Access denied; from=<[email protected] > to=<[email protected] > proto=ESMTP helo=<eE9OvgFmf> 2026-06-17T16:09:49.794935+02:00 mx1 postfix/smtps/smtpd[276537]: NOQUEUE: reject: RCPT from unknown[81.30.98.51]: 554 5.7.1 <unknown[81.30.98.51]>: Client host rejected: Access denied; from=<[email protected] > to=<[email protected] > proto=ESMTP helo=<OleKH6P>
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Brute-Force
Email Spam
🇸🇰
Eurofluid
2026-06-17 14:05:44
(13 hours ago)
You shall not pass ! Abusive behavior blocked by EF firewall.
Port Scan
Hacking
Brute-Force
🇩🇪
jasperedv.de
2026-06-17 13:15:23
(14 hours ago)
Failed SMTP Login - Brutforcing
Email Spam
Brute-Force
🇸🇰
Eurofluid
2026-06-17 13:08:39
(14 hours ago)
RdpGuard detected brute-force attempt on SMTP
Brute-Force
🇫🇷
kisiek
2026-06-17 12:37:30
(14 hours ago)
(smtpauth) Failed SMTP AUTH login from 81.30.98.51 (LT/Lithuania/-): 5 in the last 3600 secs; Ports: ...
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(smtpauth) Failed SMTP AUTH login from 81.30.98.51 (LT/Lithuania/-): 5 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_SMTPAUTH; Logs: 2026-06-17 14:37:28 login authenticator failed for H=(11PM9Bt2I) [81.30.98.51]: 535 Incorrect authentication data (set_id=biuro)
2026-06-17 14:37:28 login authenticator failed for H=(p22mRME) [81.30.98.51]: 535 Incorrect authentication data (set_id=biuro)
2026-06-17 14:37:28 login authenticator failed for H=(A8AMpIzUmI) [81.30.98.51]: 535 Incorrect authentication data ([email protected] )
2026-06-17 14:37:29 login authenticator failed for H=(3ohgMX) [81.30.98.51]: 535 Incorrect authentication data ([email protected] )
2026-06-17 14:37:29 login authenticator failed for H=(588qhbEA6d) [81.30.98.51]: 535 Incorrect authentication data (set_id=biuro)
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Port Scan