Selamat sore Pak Syafril dan rekan2 milis. Sejak adanya pemblokiran public DNS (salah satunya Google) oleh ISP atas arahan Menkominfo, email server di kantor saya jadi sering bermasalah misalnya email yang dikirim oleh user sering delay terkirim dan email yang diterima oleh user juga sering delay bahkan cenderung gagal diterima oleh server saya.
Setelah saya cek pada log SMTP(In) salah satu email yang gagal diterima itu banyak yang "Connection closed" seperti log dibawah ini : Thu 2015-04-23 00:04:40.567: ---------- Thu 2015-04-23 00:01:40.439: [710166] Session 710166; child 0049 Thu 2015-04-23 00:01:40.439: [710166] Accepting SMTP connection from 203.112.90.35:49895 to 202.158.25.18:25 Thu 2015-04-23 00:01:40.440: [710166] --> 220 mail.indokemika.co.id ESMTP MDaemon 15.0.0; Thu, 23 Apr 2015 00:01:40 +0700 Thu 2015-04-23 00:01:40.544: [710166] <-- EHLO hsbc.com.hk Thu 2015-04-23 00:01:40.545: [710166] --> 250-mail.indokemika.co.id Hello hsbc.com.hk, pleased to meet you Thu 2015-04-23 00:01:40.545: [710166] --> 250-ETRN Thu 2015-04-23 00:01:40.545: [710166] --> 250-AUTH LOGIN CRAM-MD5 PLAIN Thu 2015-04-23 00:01:40.545: [710166] --> 250-8BITMIME Thu 2015-04-23 00:01:40.545: [710166] --> 250-ENHANCEDSTATUSCODES Thu 2015-04-23 00:01:40.545: [710166] --> 250 SIZE 20480000 Thu 2015-04-23 00:01:40.596: [710166] <-- MAIL FROM:< advising.service.4864968.155720.427184...@mail.hsbcnet.hsbc.com> Thu 2015-04-23 00:01:40.598: [710166] Performing PTR lookup (35.90.112.203.IN-ADDR.ARPA) Thu 2015-04-23 00:01:40.777: [710166] * D=35.90.112.203.IN-ADDR.ARPA TTL=(34) PTR=[psmtp7.hsbc.com.hk] Thu 2015-04-23 00:01:40.958: [710166] * D=psmtp7.hsbc.com.hk TTL=(4) A=[203.112.90.35] Thu 2015-04-23 00:01:40.958: [710166] ---- End PTR results Thu 2015-04-23 00:01:40.961: [710166] Performing IP lookup (hsbc.com.hk) Thu 2015-04-23 00:01:41.147: [710166] * D=hsbc.com.hk TTL=(5) A=[203.144.59.24] Thu 2015-04-23 00:01:41.147: [710166] ---- End IP lookup results Thu 2015-04-23 00:01:41.149: [710166] Performing IP lookup ( mail.hsbcnet.hsbc.com) Thu 2015-04-23 00:02:41.556: [710166] * DNS: 60 second wait for DNS response exceeded (DNS Server: 208.67.222.222) Thu 2015-04-23 00:03:42.117: [710166] * DNS: 60 second wait for DNS response exceeded (DNS Server: 8.8.8.8) Thu 2015-04-23 00:04:42.114: [710166] * DNS: 60 second wait for DNS response exceeded (DNS Server: 84.200.69.80) Thu 2015-04-23 00:04:42.660: [710166] * P=010 S=000 D=mail.hsbcnet.hsbc.com TTL=(535) MX=[smtp1.hsbc.com.hk] Thu 2015-04-23 00:04:42.660: [710166] * P=010 S=001 D=mail.hsbcnet.hsbc.com TTL=(535) MX=[smtp2.hsbc.com.hk] Thu 2015-04-23 00:04:42.847: [710166] * D=smtp1.hsbc.com.hk TTL=(1) A=[203.112.90.3] Thu 2015-04-23 00:04:43.029: [710166] * D=smtp2.hsbc.com.hk TTL=(1) A=[203.112.85.3] Thu 2015-04-23 00:04:43.029: [710166] ---- End IP lookup results Thu 2015-04-23 00:04:43.031: [710166] --> 250 2.1.0 Sender OK Thu 2015-04-23 00:04:43.031: [710166] Connection closed Thu 2015-04-23 00:04:43.031: [710166] SMTP session terminated (Bytes in/out: 95/267) Thu 2015-04-23 00:04:43.031: ---------- Tue 2015-04-28 14:10:00.619: [972606] Session 972606; child 0017 Tue 2015-04-28 14:10:00.619: [972606] Accepting SMTP connection from 118.98.81.142:38356 to 118.97.92.178:25 Tue 2015-04-28 14:10:00.620: [972606] --> 220 mail.indokemika.co.id ESMTP MDaemon 15.0.0; Tue, 28 Apr 2015 14:10:00 +0700 Tue 2015-04-28 14:10:00.623: [972606] <-- EHLO smtp-out0142-sv2.telkom.net Tue 2015-04-28 14:10:00.623: [972606] --> 250-mail.indokemika.co.id Hello smtp-out0142-sv2.telkom.net, pleased to meet you Tue 2015-04-28 14:10:00.623: [972606] --> 250-ETRN Tue 2015-04-28 14:10:00.623: [972606] --> 250-AUTH LOGIN CRAM-MD5 PLAIN Tue 2015-04-28 14:10:00.623: [972606] --> 250-8BITMIME Tue 2015-04-28 14:10:00.623: [972606] --> 250-ENHANCEDSTATUSCODES Tue 2015-04-28 14:10:00.623: [972606] --> 250 SIZE 20480000 Tue 2015-04-28 14:10:00.624: [972606] <-- MAIL FROM:<wa...@okatrans.com> SIZE=8927 Tue 2015-04-28 14:10:00.627: [972606] Performing PTR lookup (142.81.98.118.IN-ADDR.ARPA) Tue 2015-04-28 14:10:00.813: [972606] * D=142.81.98.118.IN-ADDR.ARPA TTL=(1434) PTR=[smtp-out0142-sv2.telkom.net] Tue 2015-04-28 14:10:01.003: [972606] * D=smtp-out0142-sv2.telkom.net TTL=(9) A=[118.98.81.142] Tue 2015-04-28 14:10:01.003: [972606] ---- End PTR results Tue 2015-04-28 14:10:01.006: [972606] Performing IP lookup ( smtp-out0142-sv2.telkom.net) Tue 2015-04-28 14:10:01.201: [972606] * D=smtp-out0142-sv2.telkom.net TTL=(9) A=[118.98.81.142] Tue 2015-04-28 14:10:01.201: [972606] ---- End IP lookup results Tue 2015-04-28 14:10:01.204: [972606] Performing IP lookup (okatrans.com) Tue 2015-04-28 14:11:01.395: [972606] * DNS: 60 second wait for DNS response exceeded (DNS Server: 8.8.8.8) Tue 2015-04-28 14:12:01.407: [972606] * DNS: 60 second wait for DNS response exceeded (DNS Server: 202.158.3.7) Tue 2015-04-28 14:13:01.404: [972606] * DNS: 60 second wait for DNS response exceeded (DNS Server: 208.67.222.222) Tue 2015-04-28 14:14:01.750: [972606] * DNS: 60 second wait for DNS response exceeded (DNS Server: 84.200.69.80) Tue 2015-04-28 14:14:02.153: [972606] * P=010 S=000 D=okatrans.com TTL=(340) MX=[mx-corp.cbn.net.id] Tue 2015-04-28 14:14:02.345: [972606] * D=mx-corp.cbn.net.id TTL=(234) A=[202.158.81.27] Tue 2015-04-28 14:14:02.345: [972606] * D=mx-corp.cbn.net.id TTL=(234) A=[210.210.188.27] Tue 2015-04-28 14:14:02.345: [972606] ---- End IP lookup results Tue 2015-04-28 14:14:02.347: [972606] --> 250 2.1.0 Sender OK Tue 2015-04-28 14:14:02.347: [972606] Connection closed Tue 2015-04-28 14:14:02.347: [972606] SMTP session terminated (Bytes in/out: 76/283) Tue 2015-04-28 14:14:02.347: ---------- Untuk mempersempit pencarian penyebab masalah, rata2 yang gagal itu selalu email yang dikirim menggunakan smtp gratis dari Telkom yaitu smtp.telkom.net (untuk sender yang sama pernah dilakukan testing menggunakan smtp gratis cari CBN dan email sukses diterima server saya). Untuk contoh log saya diatas juga ada yang gagal dari hsbc.com.hk. Saya pernah mendapatkan informasi bahwa smtp.telkom.net jangan dipakai lagi karena sering bermasalah, apakah benar begitu? Saya juga melakukan test ping ke smtp.telkom.net dan hsbc.com.hk dan hasilnya RTO, apakah kalau seperti ini sudah pasti email server tidak bisa terima email jika sender mengirim email menggunakan smtp2 tersebut? Sebagai informasi tambahan, saya juga pernah test kirim email ke yahoo dan google menggunakan smtp.telkom.net dan email bisa diterima dengan sukses. Apakah ada ide bagaimana melakukan konfigurasi supaya email2 tetap bisa diterima server sebagaimana halnya server yahoo dan google? Sebelumnya pernah juga saya tanyakan kenapa saya tidak bisa membalas email ke sender yang tidak ada MX record (saran dari Pak Syafril dibuatkan MX record dummy di server) dan menurut user saya sekarang sudah bisa terkirim emailnya. Apakah metode ini juga yang dipakai oleh yahoo dan google? karena kasus tidak bisa kirim email ke domain yang tidak ada MX record ini jika dikirimkan dengan yahoo dan google bisa sukses terkirim. Sebelumnya terima kasih banyak atas bantuannya. Rusdi -- --[MDaemon-L]------------------------------------------------ Milis ini untuk Diskusi antar pengguna MDaemon Mail Server. Netiket: https://wiki.openstack.org/wiki/MailingListEtiquette Arsip: http://mdaemon-l.dutaint.com Dokumentasi : http://mdaemon.dutaint.co.id Henti Langgan: Kirim mail ke MDaemon-L-unsubscribe [at] dutaint.com Berlangganan: kirim mail ke MDaemon-L-subscribe [at] dutaint.com Versi terakhir MD 15.0.1, SP 4.5, BES 2.0.2, OC 3.0, SG 3.0.2
