dear Mr. Syafril & Team,

saya dapat laporan dari user bahwa rekanan dari luar tidak dapat melakukan sent 
email ke alamat email kami. setelah saya cek, saya mendapatkan log sbb:

Tue 2018-02-27 09:27:49.626: ----------
Tue 2018-02-27 09:28:13.797: Session 448757; child 0001
Tue 2018-02-27 09:28:13.797: Accepting SMTP connection from 45.33.110.159:61552 
to 10.0.1.60:25
Tue 2018-02-27 09:28:13.797: --> 220 mail.bintangsaudara.com ESMTP MDaemon 
17.0.2; Tue, 27 Feb 2018 09:28:13 +0700
Tue 2018-02-27 09:28:14.145: <-- HELO frelinode-sdnproxy-1.icoremail.net
Tue 2018-02-27 09:28:14.147: --> 250 mail.bintangsaudara.com Hello 
frelinode-sdnproxy-1.icoremail.net [45.33.110.159], pleased to meet you
Tue 2018-02-27 09:28:14.506: <-- MAIL FROM:<sale...@glwoodpecker.com>
Tue 2018-02-27 09:28:14.509: Performing PTR lookup (159.110.33.45.IN-ADDR.ARPA)
Tue 2018-02-27 09:28:14.619: *  D=159.110.33.45.in-addr.arpa TTL=(79) 
PTR=[frelinode-sdnproxy-1.icoremail.net]
Tue 2018-02-27 09:28:14.713: *  D=mail1.icoremail.net TTL=(9) A=[223.252.214.65]
Tue 2018-02-27 09:28:14.713: *  D=mail1.icoremail.net TTL=(9) A=[223.252.214.69]
Tue 2018-02-27 09:28:14.713: *  D=mail1.icoremail.net TTL=(9) A=[223.252.214.64]
Tue 2018-02-27 09:28:14.713: *  MDaemon configured to drop connection on PTR 
record mismatch
Tue 2018-02-27 09:28:14.713: ---- End PTR results
Tue 2018-02-27 09:28:14.713: --> 501 5.7.0 Domain must resolve
Tue 2018-02-27 09:28:14.713: SMTP session terminated (Bytes in/out: 79/221)
Tue 2018-02-27 09:28:14.713: ----------
Tue 2018-02-27 09:28:16.187: Session 448758; child 0001
Tue 2018-02-27 09:28:16.187: Accepting SMTP connection from 
139.162.11.158:57140 to 10.0.1.60:25
Tue 2018-02-27 09:28:16.188: --> 220 mail.bintangsaudara.com ESMTP MDaemon 
17.0.2; Tue, 27 Feb 2018 09:28:16 +0700
Tue 2018-02-27 09:28:16.330: <-- HELO sglinode-sdnproxy-3.icoremail.net
Tue 2018-02-27 09:28:16.331: --> 250 mail.bintangsaudara.com Hello 
sglinode-sdnproxy-3.icoremail.net [139.162.11.158], pleased to meet you
Tue 2018-02-27 09:28:16.476: <-- MAIL FROM:<sale...@glwoodpecker.com>
Tue 2018-02-27 09:28:16.479: Performing PTR lookup (158.11.162.139.IN-ADDR.ARPA)
Tue 2018-02-27 09:28:16.614: *  D=158.11.162.139.in-addr.arpa TTL=(390) 
PTR=[sglinode-sdnproxy-1.icoremail.net]
Tue 2018-02-27 09:28:16.944: *  D=mail1.icoremail.net TTL=(9) A=[223.252.214.65]
Tue 2018-02-27 09:28:16.944: *  D=mail1.icoremail.net TTL=(9) A=[223.252.214.64]
Tue 2018-02-27 09:28:16.944: *  D=mail1.icoremail.net TTL=(9) A=[223.252.214.69]
Tue 2018-02-27 09:28:16.944: *  MDaemon configured to drop connection on PTR 
record mismatch
Tue 2018-02-27 09:28:16.944: ---- End PTR results
Tue 2018-02-27 09:28:16.944: --> 501 5.7.0 Domain must resolve
Tue 2018-02-27 09:28:16.945: SMTP session terminated (Bytes in/out: 78/221)
Tue 2018-02-27 09:28:19.361: ----------
Tue 2018-02-27 09:28:20.042: Session 448761; child 0001
Tue 2018-02-27 09:28:20.042: Accepting SMTP connection from 47.90.88.91:40714 
to 10.0.1.60:25
Tue 2018-02-27 09:28:20.043: --> 220 mail.bintangsaudara.com ESMTP MDaemon 
17.0.2; Tue, 27 Feb 2018 09:28:20 +0700
Tue 2018-02-27 09:28:20.227: <-- HELO aliyun-sdnproxy-2.icoremail.net
Tue 2018-02-27 09:28:20.228: --> 250 mail.bintangsaudara.com Hello 
aliyun-sdnproxy-2.icoremail.net [47.90.88.91], pleased to meet you
Tue 2018-02-27 09:28:20.439: <-- MAIL FROM:<sale...@glwoodpecker.com>
Tue 2018-02-27 09:28:20.442: Performing PTR lookup (91.88.90.47.IN-ADDR.ARPA)
Tue 2018-02-27 09:28:20.893: *  D=91.88.90.47.in-addr.arpa TTL=(60) 
PTR=[aliyun-cloud.icoremail.net]
Tue 2018-02-27 09:28:21.888: *  No A/AAAA records found
Tue 2018-02-27 09:28:21.888: *  MDaemon configured to drop connection on PTR 
record mismatch
Tue 2018-02-27 09:28:21.888: ---- End PTR results
Tue 2018-02-27 09:28:21.888: --> 501 5.7.0 Domain must resolve
Tue 2018-02-27 09:28:21.888: SMTP session terminated (Bytes in/out: 76/216)
Tue 2018-02-27 09:28:21.888: ----------
Tue 2018-02-27 09:28:24.125: Session 448762; child 0001
Tue 2018-02-27 09:28:24.125: Accepting SMTP connection from 
178.79.144.207:50884 to 10.0.1.60:25
Tue 2018-02-27 09:28:24.126: --> 220 mail.bintangsaudara.com ESMTP MDaemon 
17.0.2; Tue, 27 Feb 2018 09:28:24 +0700
Tue 2018-02-27 09:28:24.412: <-- HELO lonlinode-sdnproxy-2.icoremail.net
Tue 2018-02-27 09:28:24.415: --> 250 mail.bintangsaudara.com Hello 
lonlinode-sdnproxy-2.icoremail.net [178.79.144.207], pleased to meet you
Tue 2018-02-27 09:28:24.720: <-- MAIL FROM:<sale...@glwoodpecker.com>
Tue 2018-02-27 09:28:24.727: Performing PTR lookup (207.144.79.178.IN-ADDR.ARPA)
Tue 2018-02-27 09:28:24.832: *  D=207.144.79.178.in-addr.arpa TTL=(39) 
PTR=[lonlinode-sdnproxy-2.icoremail.net]
Tue 2018-02-27 09:28:25.094: *  D=mail1.icoremail.net TTL=(9) A=[223.252.214.64]
Tue 2018-02-27 09:28:25.094: *  D=mail1.icoremail.net TTL=(9) A=[223.252.214.65]
Tue 2018-02-27 09:28:25.095: *  D=mail1.icoremail.net TTL=(9) A=[223.252.214.69]
Tue 2018-02-27 09:28:25.095: *  MDaemon configured to drop connection on PTR 
record mismatch
Tue 2018-02-27 09:28:25.095: ---- End PTR results
Tue 2018-02-27 09:28:25.095: --> 501 5.7.0 Domain must resolve
Tue 2018-02-27 09:28:25.095: SMTP session terminated (Bytes in/out: 79/222)
Tue 2018-02-27 09:28:25.095: ----------
Tue 2018-02-27 09:28:27.686: Session 448763; child 0001
Tue 2018-02-27 09:28:27.686: Accepting SMTP connection from 45.79.201.110:59154 
to 10.0.1.60:25
Tue 2018-02-27 09:28:27.687: --> 220 mail.bintangsaudara.com ESMTP MDaemon 
17.0.2; Tue, 27 Feb 2018 09:28:27 +0700
Tue 2018-02-27 09:28:27.966: <-- HELO atllinode-sdnproxy-3.icoremail.net
Tue 2018-02-27 09:28:27.969: --> 250 mail.bintangsaudara.com Hello 
atllinode-sdnproxy-3.icoremail.net [45.79.201.110], pleased to meet you
Tue 2018-02-27 09:28:28.250: <-- MAIL FROM:<sale...@glwoodpecker.com>
Tue 2018-02-27 09:28:28.257: Performing PTR lookup (110.201.79.45.IN-ADDR.ARPA)
Tue 2018-02-27 09:28:28.259: *  D=110.201.79.45.in-addr.arpa TTL=(384) 
PTR=[atllinode-sdnproxy-1.icoremail.net]
Tue 2018-02-27 09:28:28.433: *  D=mail1.icoremail.net TTL=(9) A=[223.252.214.64]
Tue 2018-02-27 09:28:28.433: *  D=mail1.icoremail.net TTL=(9) A=[223.252.214.69]
Tue 2018-02-27 09:28:28.433: *  D=mail1.icoremail.net TTL=(9) A=[223.252.214.65]
Tue 2018-02-27 09:28:28.433: *  MDaemon configured to drop connection on PTR 
record mismatch
Tue 2018-02-27 09:28:28.433: ---- End PTR results
Tue 2018-02-27 09:28:28.433: --> 501 5.7.0 Domain must resolve
Tue 2018-02-27 09:28:28.433: SMTP session terminated (Bytes in/out: 79/221)
Tue 2018-02-27 09:28:28.433: ----------
Tue 2018-02-27 09:28:30.267: Session 448764; child 0001
Tue 2018-02-27 09:28:30.267: Accepting SMTP connection from 139.162.70.28:54930 
to 10.0.1.60:25
Tue 2018-02-27 09:28:30.267: --> 220 mail.bintangsaudara.com ESMTP MDaemon 
17.0.2; Tue, 27 Feb 2018 09:28:30 +0700
Tue 2018-02-27 09:28:30.377: <-- HELO tkylinode-sdnproxy-1.icoremail.net
Tue 2018-02-27 09:28:30.380: --> 250 mail.bintangsaudara.com Hello 
tkylinode-sdnproxy-1.icoremail.net [139.162.70.28], pleased to meet you
Tue 2018-02-27 09:28:30.490: <-- MAIL FROM:<sale...@glwoodpecker.com>
Tue 2018-02-27 09:28:30.496: Performing PTR lookup (28.70.162.139.IN-ADDR.ARPA)
Tue 2018-02-27 09:28:30.521: *  D=28.70.162.139.in-addr.arpa TTL=(78) 
PTR=[tkylinode-sdnproxy-1.icoremail.net]
Tue 2018-02-27 09:28:30.675: *  D=mail1.icoremail.net TTL=(8) A=[223.252.214.69]
Tue 2018-02-27 09:28:30.675: *  D=mail1.icoremail.net TTL=(8) A=[223.252.214.65]
Tue 2018-02-27 09:28:30.675: *  D=mail1.icoremail.net TTL=(8) A=[223.252.214.64]
Tue 2018-02-27 09:28:30.675: *  MDaemon configured to drop connection on PTR 
record mismatch
Tue 2018-02-27 09:28:30.675: ---- End PTR results
Tue 2018-02-27 09:28:30.675: --> 501 5.7.0 Domain must resolve
Tue 2018-02-27 09:28:30.675: SMTP session terminated (Bytes in/out: 79/221)


mohon bantuannya.

Regards,

Sucipto


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