debian - Email overload ISPConfig 3 Server... Hacked? -



debian - Email overload ISPConfig 3 Server... Hacked? -

since late yesterday email queue specific user have risen on 45,000. emails undeliverables messages user did not send - @ to the lowest degree intentionally.

here snippet of mail.log file.. many of addresses non-existant users, domain correct, not user.

any ideas going on , how can stop it?

p.s. replaced real domain "mydomain.co.uk". live user on domain user called "mike".

jun 22 19:28:05 server1 postfix/smtpd[5305]: 6843dfb270: client=81.61.129.17.dyn.user.ono.com[81.61.129.17], sasl_method=login, sasl_username=mike@mydomain.co.uk jun 22 19:28:05 server1 postfix/cleanup[5499]: 3b2b5fb269: message-id= jun 22 19:28:05 server1 postfix/qmgr[4391]: 3b2b5fb269: from=, size=715, nrcpt=1 (queue active) jun 22 19:28:05 server1 postfix/smtpd[5159]: abf72fb271: client=unknown[37.218.171.206], sasl_method=login, sasl_username=mike@mydomain.co.uk jun 22 19:28:05 server1 postfix/cleanup[5594]: b1decfb26c: message-id= jun 22 19:28:05 server1 postfix/qmgr[4391]: b1decfb26c: from=, size=680, nrcpt=1 (queue active) jun 22 19:28:05 server1 postfix/smtpd[5474]: ed465fb272: client=unknown[181.112.50.130], sasl_method=login, sasl_username=mike@mydomain.co.uk jun 22 19:28:06 server1 postfix/smtpd[5057]: 189e4fb273: client=unknown[27.75.56.22], sasl_method=login, sasl_username=mike@mydomain.co.uk jun 22 19:28:06 server1 postfix/cleanup[5645]: 0c65cfb267: message-id= jun 22 19:28:06 server1 postfix/qmgr[4391]: 0c65cfb267: from=, size=690, nrcpt=1 (queue active) jun 22 19:28:06 server1 postfix/cleanup[5515]: 127f5fb26e: message-id= jun 22 19:28:06 server1 postfix/qmgr[4391]: 127f5fb26e: from=, size=697, nrcpt=1 (queue active) jun 22 19:28:06 server1 postfix/cleanup[5644]: 6843dfb270: message-id=<8repfy1t-uqlx-nxwh-jal6-gbv9jm53ne4p@mydomain.co.uk> jun 22 19:28:06 server1 postfix/qmgr[4391]: 6843dfb270: from=, size=703, nrcpt=1 (queue active) jun 22 19:28:06 server1 postfix/cleanup[5598]: e73c2fb25f: message-id= jun 22 19:28:06 server1 postfix/cleanup[5607]: bedb4fb26d: message-id= jun 22 19:28:06 server1 postfix/qmgr[4391]: bedb4fb26d: from=, size=674, nrcpt=1 (queue active) jun 22 19:28:06 server1 postfix/qmgr[4391]: e73c2fb25f: from=, size=690, nrcpt=1 (queue active) jun 22 19:28:06 server1 postfix/smtpd[5052]: 95065fb274: client=unknown[94.99.25.28], sasl_method=login, sasl_username=mike@mydomain.co.uk jun 22 19:28:06 server1 postfix/cleanup[5646]: 9858bfb26b: message-id= jun 22 19:28:06 server1 postfix/cleanup[5643]: 37753fb26f: message-id= jun 22 19:28:06 server1 postfix/qmgr[4391]: 37753fb26f: from=, size=827, nrcpt=1 (queue active) jun 22 19:28:06 server1 postfix/qmgr[4391]: 9858bfb26b: from=, size=692, nrcpt=1 (queue active) jun 22 19:28:06 server1 postfix/smtpd[5357]: a9e14fb275: client=unknown[181.211.189.214], sasl_method=login, sasl_username=mike@mydomain.co.uk jun 22 19:28:06 server1 postfix/smtpd[5305]: c5767fb276: client=81.61.129.17.dyn.user.ono.com[81.61.129.17], sasl_method=login, sasl_username=mike@mydomain.co.uk jun 22 19:28:06 server1 postfix/cleanup[5593]: 69984fb26a: message-id= jun 22 19:28:06 server1 postfix/qmgr[4391]: 69984fb26a: from=, size=715, nrcpt=1 (queue active) jun 22 19:28:07 server1 postfix/smtpd[5208]: 17f14fb277: client=unknown[190.233.125.58], sasl_method=login, sasl_username=mike@mydomain.co.uk jun 22 19:28:07 server1 postfix/cleanup[5641]: ed465fb272: message-id= jun 22 19:28:07 server1 postfix/qmgr[4391]: ed465fb272: from=, size=715, nrcpt=1 (queue active) jun 22 19:28:07 server1 postfix/cleanup[5613]: abf72fb271: message-id= jun 22 19:28:07 server1 postfix/qmgr[4391]: abf72fb271: from=, size=706, nrcpt=1 (queue active) jun 22 19:28:07 server1 postfix/smtpd[5304]: 85087fb278: client=unknown[37.150.230.145], sasl_method=login, sasl_username=mike@mydomain.co.uk jun 22 19:28:07 server1 postfix/cleanup[5515]: c5767fb276: message-id= jun 22 19:28:07 server1 postfix/qmgr[4391]: c5767fb276: from=, size=701, nrcpt=1 (queue active) jun 22 19:28:07 server1 postfix/smtpd[5494]: 9dba9fb279: client=unknown[14.167.36.85], sasl_method=login, sasl_username=mike@mydomain.co.uk

your email account's login info has been intercepted. when @ ip addresses (i looked @ 4) come peru, ecuador, kingdom of saudi arabia , china.

change password , restart sasl

debian postfix-mta

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