Dear Pak Syafril,

Saya menemukan issue ini : Performing Backscatter Protection, kira-kira 
penyebabnya apa ya ?

Wed 2024-03-06 02:31:58.669: [13655447] Session 13655447; child 0002
Wed 2024-03-06 02:31:58.669: [13655447] Accepting SMTP connection from 
210.210.188.92:24871 to 192.168.1.19:25
Wed 2024-03-06 02:31:58.669: [13655447] Location Screen says connection is from 
Indonesia, Asia
Wed 2024-03-06 02:31:58.671: [13655447] --> 220 mail.aio.co.id ESMTP MDaemon 
23.0.1; Wed, 06 Mar 2024 02:31:58 +0700
Wed 2024-03-06 02:31:58.673: [13655447] <-- EHLO mx-corp3.cbn.net.id
Wed 2024-03-06 02:31:58.673: [13655447] --> 250-mail.aio.co.id Hello 
mx-corp3.cbn.net.id [210.210.188.92], pleased to meet you
Wed 2024-03-06 02:31:58.673: [13655447] --> 250-ETRN
Wed 2024-03-06 02:31:58.673: [13655447] --> 250-8BITMIME
Wed 2024-03-06 02:31:58.673: [13655447] --> 250-ENHANCEDSTATUSCODES
Wed 2024-03-06 02:31:58.673: [13655447] --> 250-PIPELINING
Wed 2024-03-06 02:31:58.673: [13655447] --> 250-CHUNKING
Wed 2024-03-06 02:31:58.673: [13655447] --> 250-STARTTLS
Wed 2024-03-06 02:31:58.673: [13655447] --> 250 SIZE 52428800
Wed 2024-03-06 02:31:58.674: [13655447] <-- MAIL FROM:<> SIZE=5617 BODY=8BITMIME
Wed 2024-03-06 02:31:58.676: [13655447] Performing SPF lookup 
(mx-corp3.cbn.net.id / 210.210.188.92)
Wed 2024-03-06 02:31:58.683: [13655447] *  Result: none; no SPF record in DNS
Wed 2024-03-06 02:31:58.683: [13655447] ---- End SPF results
Wed 2024-03-06 02:31:58.683: [13655447] --> 250 2.1.0 Sender OK
Wed 2024-03-06 02:31:58.684: [13655447] <-- RCPT TO:<gsulaks...@aio.co.id>
Wed 2024-03-06 02:31:58.686: [13655447] Performing Backscatter Protection...
Wed 2024-03-06 02:31:58.687: [13655447] *  Address: gsulaks...@aio.co.id
Wed 2024-03-06 02:31:58.687: [13655447] *  Verifier: <none>
Wed 2024-03-06 02:31:58.687: [13655447] *  Result: fail
Wed 2024-03-06 02:31:58.687: [13655447] *  Reject: Yes
Wed 2024-03-06 02:31:58.687: [13655447] --- End Backscatter Protection
Wed 2024-03-06 02:31:58.687: [13655447] --> 550 5.1.1 Backscatter Protection 
detected an invalid or expired email address
Wed 2024-03-06 02:31:58.695: [13655447] <-- RSET
Wed 2024-03-06 02:31:58.695: [13655447] --> 250 2.0.0 RSET? Well, OK
Wed 2024-03-06 02:31:58.696: [13655447] <-- QUIT
Wed 2024-03-06 02:31:58.696: [13655447] --> 221 2.0.0 See ya in cyberspace
Wed 2024-03-06 02:31:58.696: [13655447] SMTP session terminated (Bytes in/out: 
108/428)
Wed 2024-03-06 02:31:58.696: ----------

Wed 2024-03-06 02:31:58.678: [13655448] Session 13655448; child 0003
Wed 2024-03-06 02:31:58.678: [13655448] Accepting SMTP connection from 
210.210.188.92:24837 to 192.168.1.19:25
Wed 2024-03-06 02:31:58.678: [13655448] Location Screen says connection is from 
Indonesia, Asia
Wed 2024-03-06 02:31:58.679: [13655448] --> 220 mail.aio.co.id ESMTP MDaemon 
23.0.1; Wed, 06 Mar 2024 02:31:58 +0700
Wed 2024-03-06 02:31:58.681: [13655448] <-- EHLO mx-corp3.cbn.net.id
Wed 2024-03-06 02:31:58.681: [13655448] --> 250-mail.aio.co.id Hello 
mx-corp3.cbn.net.id [210.210.188.92], pleased to meet you
Wed 2024-03-06 02:31:58.681: [13655448] --> 250-ETRN
Wed 2024-03-06 02:31:58.681: [13655448] --> 250-8BITMIME
Wed 2024-03-06 02:31:58.681: [13655448] --> 250-ENHANCEDSTATUSCODES
Wed 2024-03-06 02:31:58.681: [13655448] --> 250-PIPELINING
Wed 2024-03-06 02:31:58.681: [13655448] --> 250-CHUNKING
Wed 2024-03-06 02:31:58.681: [13655448] --> 250-STARTTLS
Wed 2024-03-06 02:31:58.681: [13655448] --> 250 SIZE 52428800
Wed 2024-03-06 02:31:58.682: [13655448] <-- MAIL FROM:<> SIZE=5799 BODY=8BITMIME
Wed 2024-03-06 02:31:58.688: [13655448] Performing SPF lookup 
(mx-corp3.cbn.net.id / 210.210.188.92)
Wed 2024-03-06 02:31:58.691: [13655448] *  Result: none; no SPF record in DNS
Wed 2024-03-06 02:31:58.691: [13655448] ---- End SPF results
Wed 2024-03-06 02:31:58.691: [13655448] --> 250 2.1.0 Sender OK
Wed 2024-03-06 02:31:58.692: [13655448] <-- RCPT TO:<apamung...@aio.co.id>
Wed 2024-03-06 02:31:58.693: [13655448] Performing Backscatter Protection...
Wed 2024-03-06 02:31:58.693: [13655448] *  Address: apamung...@aio.co.id
Wed 2024-03-06 02:31:58.693: [13655448] *  Verifier: <none>
Wed 2024-03-06 02:31:58.693: [13655448] *  Result: fail
Wed 2024-03-06 02:31:58.693: [13655448] *  Reject: Yes
Wed 2024-03-06 02:31:58.693: [13655448] --- End Backscatter Protection
Wed 2024-03-06 02:31:58.693: [13655448] --> 550 5.1.1 Backscatter Protection 
detected an invalid or expired email address
Wed 2024-03-06 02:31:58.695: [13655448] <-- RSET
Wed 2024-03-06 02:31:58.695: [13655448] --> 250 2.0.0 RSET? Well, OK
Wed 2024-03-06 02:31:58.696: [13655448] <-- QUIT
Wed 2024-03-06 02:31:58.696: [13655448] --> 221 2.0.0 See ya in cyberspace
Wed 2024-03-06 02:31:58.696: [13655448] SMTP session terminated (Bytes in/out: 
108/428)
Wed 2024-03-06 02:31:58.700: ----------

Wed 2024-03-06 02:31:58.684: [13655449] Session 13655449; child 0004
Wed 2024-03-06 02:31:58.684: [13655449] Accepting SMTP connection from 
210.210.188.92:24866 to 192.168.1.19:25
Wed 2024-03-06 02:31:58.684: [13655449] Location Screen says connection is from 
Indonesia, Asia
Wed 2024-03-06 02:31:58.686: [13655449] --> 220 mail.aio.co.id ESMTP MDaemon 
23.0.1; Wed, 06 Mar 2024 02:31:58 +0700
Wed 2024-03-06 02:31:58.688: [13655449] <-- EHLO mx-corp3.cbn.net.id
Wed 2024-03-06 02:31:58.688: [13655449] --> 250-mail.aio.co.id Hello 
mx-corp3.cbn.net.id [210.210.188.92], pleased to meet you
Wed 2024-03-06 02:31:58.688: [13655449] --> 250-ETRN
Wed 2024-03-06 02:31:58.688: [13655449] --> 250-8BITMIME
Wed 2024-03-06 02:31:58.688: [13655449] --> 250-ENHANCEDSTATUSCODES
Wed 2024-03-06 02:31:58.688: [13655449] --> 250-PIPELINING
Wed 2024-03-06 02:31:58.688: [13655449] --> 250-CHUNKING
Wed 2024-03-06 02:31:58.688: [13655449] --> 250-STARTTLS
Wed 2024-03-06 02:31:58.688: [13655449] --> 250 SIZE 52428800
Wed 2024-03-06 02:31:58.690: [13655449] <-- MAIL FROM:<> SIZE=5719 BODY=8BITMIME
Wed 2024-03-06 02:31:58.692: [13655449] Performing SPF lookup 
(mx-corp3.cbn.net.id / 210.210.188.92)
Wed 2024-03-06 02:31:58.694: [13655449] *  Result: none; no SPF record in DNS
Wed 2024-03-06 02:31:58.694: [13655449] ---- End SPF results
Wed 2024-03-06 02:31:58.694: [13655449] --> 250 2.1.0 Sender OK
Wed 2024-03-06 02:31:58.695: [13655449] <-- RCPT TO:<a...@aio.co.id>
Wed 2024-03-06 02:31:58.696: [13655449] Performing Backscatter Protection...
Wed 2024-03-06 02:31:58.696: [13655449] *  Address: a...@aio.co.id
Wed 2024-03-06 02:31:58.696: [13655449] *  Verifier: <none>
Wed 2024-03-06 02:31:58.696: [13655449] *  Result: fail
Wed 2024-03-06 02:31:58.696: [13655449] *  Reject: Yes
Wed 2024-03-06 02:31:58.696: [13655449] --- End Backscatter Protection
Wed 2024-03-06 02:31:58.696: [13655449] --> 550 5.1.1 Backscatter Protection 
detected an invalid or expired email address
Wed 2024-03-06 02:31:58.698: [13655449] <-- RSET
Wed 2024-03-06 02:31:58.700: [13655449] --> 250 2.0.0 RSET? Well, OK
Wed 2024-03-06 02:31:58.702: [13655449] <-- QUIT
Wed 2024-03-06 02:31:58.702: [13655449] --> 221 2.0.0 See ya in cyberspace
Wed 2024-03-06 02:31:58.702: [13655449] SMTP session terminated (Bytes in/out: 
102/428)
Wed 2024-03-06 02:31:58.703: ----------

Wed 2024-03-06 02:31:58.731: [13655450] Session 13655450; child 0002
Wed 2024-03-06 02:31:58.731: [13655450] Accepting SMTP connection from 
210.210.188.92:24844 to 192.168.1.19:25
Wed 2024-03-06 02:31:58.731: [13655450] Location Screen says connection is from 
Indonesia, Asia
Wed 2024-03-06 02:31:58.732: [13655450] --> 220 mail.aio.co.id ESMTP MDaemon 
23.0.1; Wed, 06 Mar 2024 02:31:58 +0700
Wed 2024-03-06 02:31:58.735: [13655450] <-- EHLO mx-corp3.cbn.net.id
Wed 2024-03-06 02:31:58.735: [13655450] --> 250-mail.aio.co.id Hello 
mx-corp3.cbn.net.id [210.210.188.92], pleased to meet you
Wed 2024-03-06 02:31:58.735: [13655450] --> 250-ETRN
Wed 2024-03-06 02:31:58.735: [13655450] --> 250-8BITMIME
Wed 2024-03-06 02:31:58.735: [13655450] --> 250-ENHANCEDSTATUSCODES
Wed 2024-03-06 02:31:58.735: [13655450] --> 250-PIPELINING
Wed 2024-03-06 02:31:58.735: [13655450] --> 250-CHUNKING
Wed 2024-03-06 02:31:58.735: [13655450] --> 250-STARTTLS
Wed 2024-03-06 02:31:58.735: [13655450] --> 250 SIZE 52428800
Wed 2024-03-06 02:31:58.737: [13655450] <-- MAIL FROM:<> SIZE=5789 BODY=8BITMIME
Wed 2024-03-06 02:31:58.739: [13655450] Performing SPF lookup 
(mx-corp3.cbn.net.id / 210.210.188.92)
Wed 2024-03-06 02:31:58.742: [13655450] *  Result: none; no SPF record in DNS
Wed 2024-03-06 02:31:58.742: [13655450] ---- End SPF results
Wed 2024-03-06 02:31:58.742: [13655450] --> 250 2.1.0 Sender OK
Wed 2024-03-06 02:31:58.744: [13655450] <-- RCPT TO:<fjamalu...@aio.co.id>
Wed 2024-03-06 02:31:58.745: [13655450] Performing Backscatter Protection...
Wed 2024-03-06 02:31:58.745: [13655450] *  Address: fjamalu...@aio.co.id
Wed 2024-03-06 02:31:58.745: [13655450] *  Verifier: <none>
Wed 2024-03-06 02:31:58.745: [13655450] *  Result: fail
Wed 2024-03-06 02:31:58.745: [13655450] *  Reject: Yes
Wed 2024-03-06 02:31:58.745: [13655450] --- End Backscatter Protection
Wed 2024-03-06 02:31:58.745: [13655450] --> 550 5.1.1 Backscatter Protection 
detected an invalid or expired email address
Wed 2024-03-06 02:31:58.748: [13655450] <-- RSET
Wed 2024-03-06 02:31:58.748: [13655450] --> 250 2.0.0 RSET? Well, OK
Wed 2024-03-06 02:31:58.780: [13655450] <-- RSET
Wed 2024-03-06 02:31:58.780: [13655450] --> 250 2.0.0 RSET? Well, OK
Wed 2024-03-06 02:31:58.781: [13655450] <-- MAIL FROM:<> SIZE=12975 
BODY=8BITMIME
Wed 2024-03-06 02:31:58.783: [13655450] Performing SPF lookup 
(mx-corp3.cbn.net.id / 210.210.188.92)
Wed 2024-03-06 02:31:58.786: [13655450] *  Result: none; no SPF record in DNS
Wed 2024-03-06 02:31:58.786: [13655450] ---- End SPF results
Wed 2024-03-06 02:31:58.786: [13655450] --> 250 2.1.0 Sender OK
Wed 2024-03-06 02:31:58.787: [13655450] <-- RCPT TO:<swira...@aio.co.id>
Wed 2024-03-06 02:31:58.788: [13655450] Performing Backscatter Protection...
Wed 2024-03-06 02:31:58.788: [13655450] *  Address: swira...@aio.co.id
Wed 2024-03-06 02:31:58.788: [13655450] *  Verifier: <none>
Wed 2024-03-06 02:31:58.788: [13655450] *  Result: fail
Wed 2024-03-06 02:31:58.788: [13655450] *  Reject: Yes
Wed 2024-03-06 02:31:58.788: [13655450] --- End Backscatter Protection
Wed 2024-03-06 02:31:58.788: [13655450] --> 550 5.1.1 Backscatter Protection 
detected an invalid or expired email address
Wed 2024-03-06 02:31:58.790: [13655450] <-- RSET
Wed 2024-03-06 02:31:58.790: [13655450] --> 250 2.0.0 RSET? Well, OK
Wed 2024-03-06 02:32:00.794: [13655450] Connection closed
Wed 2024-03-06 02:32:00.794: [13655450] SMTP session terminated (Bytes in/out: 
183/548)
Wed 2024-03-06 02:32:00.794: ----------

Best Regards,

Slamet Raharjo
IT Dept.


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