Hello,
All of a sudden many users on our server have started getting marketing mail from one SNEHA sending all sorts of CITIBANK offers, it uses diff IP address with every mail
Sender ID's first part "sneha@srv1".[domain changes.com] remains same but suffix / second part keep changes with every mail, i can't seem to find which ID is compromised to send such mails , my all logs are set on detailed, i've given my SMTP log output of few deliveries
00:28:15 [188.166.14.169][13823647] rsp: 220 mail.ourhostname.com
00:28:15 [188.166.14.169][13823647] connected at 4/9/2016 12:28:15 AM
00:28:15 [188.166.14.169][13823647] cmd: EHLO srv1.biggestsale.in
00:28:15 [188.166.14.169][13823647] rsp: 250-mail.ourhostname.com Hello [188.166.14.169]250-SIZE 14680064250-AUTH LOGIN CRAM-MD5250 OK
00:28:15 [188.166.14.169][13823647] cmd: MAIL FROM:<sneha@srv1.biggestsale.in>
00:28:15 [188.166.14.169][13823647] rsp: 250 OK <sneha@srv1.biggestsale.in> Sender ok
00:28:15 [188.166.14.169][13823647] cmd: RCPT TO:<user1@custdomain.com>
00:28:15 [188.166.14.169][13823647] rsp: 452 <user1@custdomain.com> Mailbox size limit exceeded
00:28:15 [188.166.14.169][13823647] cmd: QUIT
00:28:15 [188.166.14.169][13823647] rsp: 221 Service closing transmission channel
00:28:15 [188.166.14.169][13823647] disconnected at 4/9/2016 12:28:15 AM
00:28:20 [107.170.3.199][37206595] rsp: 220 mail.ourhostname.com
00:28:20 [107.170.3.199][37206595] connected at 4/9/2016 12:28:20 AM
00:28:20 [107.170.3.199][37206595] cmd: EHLO srv9.biggestsale.in
00:28:20 [107.170.3.199][37206595] rsp: 250-mail.ourhostname.com Hello [107.170.3.199]250-SIZE 14680064250-AUTH LOGIN CRAM-MD5250 OK
00:28:20 [107.170.3.199][37206595] cmd: MAIL FROM:<sneha@srv1.biggestsale.in>
00:28:20 [107.170.3.199][37206595] rsp: 250 OK <sneha@srv1.biggestsale.in> Sender ok
00:28:21 [107.170.3.199][37206595] cmd: RCPT TO:<user2@custdomain.com>
00:28:21 [107.170.3.199][37206595] rsp: 452 <user2@custdomain.com> Mailbox size limit exceeded
00:28:21 [107.170.3.199][37206595] cmd: RSET
00:28:21 [107.170.3.199][37206595] rsp: 250 OK
00:28:21 [107.170.3.199][37206595] cmd: MAIL FROM:<sneha@srv1.biggestsale.in>
00:28:21 [107.170.3.199][37206595] rsp: 250 OK <sneha@srv1.biggestsale.in> Sender ok
00:28:21 [107.170.3.199][37206595] cmd: RCPT TO:<user5@custdomain.com>
00:28:21 [107.170.3.199][37206595] rsp: 452 <user5@custdomain.com> Mailbox size limit exceeded
00:28:21 [107.170.3.199][37206595] cmd: RSET
00:28:21 [107.170.3.199][37206595] rsp: 250 OK
00:28:22 [107.170.3.199][37206595] cmd: MAIL FROM:<sneha@srv1.biggestsale.in>
00:28:22 [107.170.3.199][37206595] rsp: 250 OK <sneha@srv1.biggestsale.in> Sender ok
00:28:22 [107.170.3.199][37206595] cmd: RCPT TO:<jyoti@custdomain.com>
00:28:22 [107.170.3.199][37206595] rsp: 452 <jyoti@custdomain.com> Mailbox size limit exceeded
00:28:22 [107.170.3.199][37206595] cmd: RSET
00:28:22 [107.170.3.199][37206595] rsp: 250 OK
00:28:22 [107.170.3.199][37206595] cmd: MAIL FROM:<sneha@srv1.biggestsale.in>
00:28:22 [107.170.3.199][37206595] rsp: 250 OK <sneha@srv1.biggestsale.in> Sender ok
00:28:22 [107.170.3.199][37206595] cmd: RCPT TO:<jyoti@custdomain.com>
00:28:22 [107.170.3.199][37206595] rsp: 452 <jyoti@custdomain.com> Mailbox size limit exceeded
00:28:23 [107.170.3.199][37206595] cmd: QUIT
00:28:23 [107.170.3.199][37206595] rsp: 221 Service closing transmission channel
00:28:23 [107.170.3.199][37206595] disconnected at 4/9/2016 12:28:23 AM
00:33:44 [45.55.35.15][57848855] rsp: 220 mail.ourhostname.com
00:33:44 [45.55.35.15][57848855] connected at 4/9/2016 12:33:44 AM
00:33:44 [45.55.35.15][57848855] cmd: EHLO srv5.biggestsale.in
00:33:44 [45.55.35.15][57848855] rsp: 250-mail.ourhostname.com Hello [45.55.35.15]250-SIZE 14680064250-AUTH LOGIN CRAM-MD5250 OK
00:33:44 [45.55.35.15][57848855] cmd: MAIL FROM:<sneha@srv1.biggestsale.in>
00:33:44 [45.55.35.15][57848855] rsp: 250 OK <sneha@srv1.biggestsale.in> Sender ok
00:33:44 [45.55.35.15][57848855] cmd: RCPT TO:<user3@custdomain2.com>
00:33:44 [45.55.35.15][57848855] rsp: 452 <user3@custdomain2.com> Mailbox size limit exceeded
00:33:45 [45.55.35.15][57848855] cmd: QUIT
00:33:45 [45.55.35.15][57848855] rsp: 221 Service closing transmission channel
00:33:45 [45.55.35.15][57848855] disconnected at 4/9/2016 12:33:45 AM
00:49:52 [104.37.184.125][32089619] rsp: 220 mail.ourhostname.com
00:49:52 [104.37.184.125][32089619] connected at 4/9/2016 12:49:52 AM
00:49:52 [104.37.184.125][32089619] cmd: EHLO mta125.vconnectbox.in
00:49:52 [104.37.184.125][32089619] rsp: 250-mail.ourhostname.com Hello [104.37.184.125]250-SIZE 14680064250-AUTH LOGIN CRAM-MD5250 OK
00:49:52 [104.37.184.125][32089619] cmd: MAIL FROM:<sneha@srv4.vconnectbox.in>
00:49:52 [104.37.184.125][32089619] rsp: 250 OK <sneha@srv4.vconnectbox.in> Sender ok
00:49:52 [104.37.184.125][32089619] cmd: RCPT TO:<smwrwest@custdomain2.com>
00:49:52 [104.37.184.125][32089619] rsp: 452 <smwrwest@custdomain2.com> Mailbox size limit exceeded
00:49:55 [104.37.184.125][32089619] cmd: RSET
00:49:55 [104.37.184.125][32089619] rsp: 250 OK
00:49:56 [104.37.184.125][32089619] cmd: MAIL FROM:<sneha@srv4.vconnectbox.in>
00:49:56 [104.37.184.125][32089619] rsp: 250 OK <sneha@srv4.vconnectbox.in> Sender ok
00:49:56 [104.37.184.125][32089619] cmd: RCPT TO:<user5@custdomain2.com>
00:49:56 [104.37.184.125][32089619] rsp: 452 <user5@custdomain2.com> Mailbox size limit exceeded
00:49:58 [104.37.184.125][32089619] cmd: QUIT
00:49:58 [104.37.184.125][32089619] rsp: 221 Service closing transmission channel
00:49:58 [104.37.184.125][32089619] disconnected at 4/9/2016 12:49:58 AM
00:50:37 [107.170.3.199][7177866] rsp: 220 mail.ourhostname.com
00:50:37 [107.170.3.199][7177866] connected at 4/9/2016 12:50:37 AM
00:50:37 [107.170.3.199][7177866] cmd: EHLO srv9.biggestsale.in
00:50:37 [107.170.3.199][7177866] rsp: 250-mail.ourhostname.com Hello [107.170.3.199]250-SIZE 14680064250-AUTH LOGIN CRAM-MD5250 OK
00:50:38 [107.170.3.199][7177866] cmd: MAIL FROM:<sneha@srv1.biggestsale.in>
00:50:38 [107.170.3.199][7177866] rsp: 250 OK <sneha@srv1.biggestsale.in> Sender ok
00:50:38 [107.170.3.199][7177866] cmd: RCPT TO:<delhi@custdomain3.com>
00:50:38 [107.170.3.199][7177866] rsp: 452 <delhi@custdomain3.com> Mailbox size limit exceeded
00:50:38 [107.170.3.199][7177866] cmd: RSET
00:50:38 [107.170.3.199][7177866] rsp: 250 OK
00:50:38 [107.170.3.199][7177866] cmd: MAIL FROM:<sneha@srv1.biggestsale.in>
00:50:38 [107.170.3.199][7177866] rsp: 250 OK <sneha@srv1.biggestsale.in> Sender ok
00:50:38 [107.170.3.199][7177866] cmd: RCPT TO:<delhi@custdomain3.com>
00:50:38 [107.170.3.199][7177866] rsp: 452 <delhi@custdomain3.com> Mailbox size limit exceeded
00:50:39 [107.170.3.199][7177866] cmd: QUIT
00:50:39 [107.170.3.199][7177866] rsp: 221 Service closing transmission channel
00:50:39 [107.170.3.199][7177866] disconnected at 4/9/2016 12:50:39 AM
00:51:22 [159.203.64.23][2063564] rsp: 220 mail.ourhostname.com
00:51:22 [159.203.64.23][2063564] connected at 4/9/2016 12:51:22 AM
00:51:22 [159.203.64.23][2063564] cmd: EHLO srv6.biggestsale.in
00:51:22 [159.203.64.23][2063564] rsp: 250-mail.ourhostname.com Hello [159.203.64.23]250-SIZE 14680064250-AUTH LOGIN CRAM-MD5250 OK
00:51:22 [159.203.64.23][2063564] cmd: MAIL FROM:<sneha@srv1.biggestsale.in>
00:51:22 [159.203.64.23][2063564] rsp: 250 OK <sneha@srv1.biggestsale.in> Sender ok
00:51:22 [159.203.64.23][2063564] cmd: RCPT TO:<user4@custdomain2.com>
00:51:22 [159.203.64.23][2063564] rsp: 452 <user4@custdomain2.com> Mailbox size limit exceeded
00:51:23 [159.203.64.23][2063564] cmd: QUIT
00:51:23 [159.203.64.23][2063564] rsp: 221 Service closing transmission channel
00:51:23 [159.203.64.23][2063564] disconnected at 4/9/2016 12:51:23 AM
00:52:54 [188.166.73.178][28278292] rsp: 220 mail.ourhostname.com
00:52:54 [188.166.73.178][28278292] connected at 4/9/2016 12:52:54 AM
00:52:55 [188.166.73.178][28278292] cmd: EHLO srv4.biggestsale.in
00:52:55 [188.166.73.178][28278292] rsp: 250-mail.ourhostname.com Hello [188.166.73.178]250-SIZE 14680064250-AUTH LOGIN CRAM-MD5250 OK
00:52:55 [188.166.73.178][28278292] cmd: MAIL FROM:<sneha@srv1.biggestsale.in>
00:52:55 [188.166.73.178][28278292] rsp: 250 OK <sneha@srv1.biggestsale.in> Sender ok
00:52:55 [188.166.73.178][28278292] cmd: RCPT TO:<user6@custdomain2.com>
00:52:55 [188.166.73.178][28278292] rsp: 452 <user6@custdomain2.com> Mailbox size limit exceeded
00:52:55 [188.166.73.178][28278292] cmd: QUIT
00:52:55 [188.166.73.178][28278292] rsp: 221 Service closing transmission channel
00:52:55 [188.166.73.178][28278292] disconnected at 4/9/2016 12:52:55 AM