>karena telkom.net.id hanya menerapkan DNS filtering terhadap DNS server 
>miliknya
>saja, maka mestinya cukup ganti DNS resolver di MDaemon menggunakan public IP.

Baik pak, terima kasih penjelasannya.

Lalu saya ada pertanyaan lagi pak, dari log berikut:

Mon 2021-02-08 14:24:58.145: [089731] Session 089731; child 0127
Mon 2021-02-08 14:24:58.145: [089731] Accepting SMTP connection from 
167.89.35.243:24552 to 172.16.10.10:25
Mon 2021-02-08 14:24:58.146: [089731] --> 220 mail.ciputra.co.id ESMTP MDaemon 
17.5.3; Mon, 08 Feb 2021 14:24:58 +0700
Mon 2021-02-08 14:24:58.426: [089731] <-- EHLO o5.email.wetransfer.com
Mon 2021-02-08 14:24:58.426: [089731] Performing SPF lookup 
(o5.email.wetransfer.com / 167.89.35.243)
Mon 2021-02-08 14:25:58.508: [089731] *  DNS: 60 second wait for DNS response 
exceeded (DNS Server: 103.78.215.212)
Mon 2021-02-08 14:26:58.510: [089731] *  DNS: 60 second wait for DNS response 
exceeded (DNS Server: 8.8.8.8)
Mon 2021-02-08 14:27:58.512: [089731] *  DNS: 60 second wait for DNS response 
exceeded (DNS Server: 8.8.4.4)
Mon 2021-02-08 14:27:59.357: [089731] *  Result: none; no SPF record in DNS
Mon 2021-02-08 14:27:59.357: [089731] ---- End SPF results

Mon 2021-02-08 14:27:32.090: [089874] Session 089874; child 0089
Mon 2021-02-08 14:27:32.090: [089874] Accepting SMTP connection from 
149.72.192.132:53156 to 172.16.10.10:25
Mon 2021-02-08 14:27:32.091: [089874] --> 220 mail.ciputra.co.id ESMTP MDaemon 
17.5.3; Mon, 08 Feb 2021 14:27:32 +0700
Mon 2021-02-08 14:27:32.357: [089874] <-- EHLO o1.ptr408.landbot.email
Mon 2021-02-08 14:27:32.357: [089874] Performing SPF lookup 
(o1.ptr408.landbot.email / 149.72.192.132)
Mon 2021-02-08 14:27:52.772: [089874] *  Result: none; no SPF record in DNS
Mon 2021-02-08 14:27:52.772: [089874] ---- End SPF results

Mon 2021-02-08 14:27:32.812: [089875] Session 089875; child 0089
Mon 2021-02-08 14:27:32.812: [089875] Accepting SMTP connection from 
202.159.32.55:59811 to 172.16.10.10:25
Mon 2021-02-08 14:27:32.812: [089875] --> 220 mail.ciputra.co.id ESMTP MDaemon 
17.5.3; Mon, 08 Feb 2021 14:27:32 +0700
Mon 2021-02-08 14:27:32.821: [089875] <-- EHLO smtp2b.indo.net.id
Mon 2021-02-08 14:27:32.821: [089875] Performing SPF lookup (smtp2b.indo.net.id 
/ 202.159.32.55)
Mon 2021-02-08 14:28:32.893: [089875] *  DNS: 60 second wait for DNS response 
exceeded (DNS Server: 8.8.8.8)
Mon 2021-02-08 14:28:32.909: [089875] *  Result: none; no SPF record in DNS
Mon 2021-02-08 14:28:32.909: [089875] ---- End SPF results

Mengapa lama memproses performing SPF lookup nya berbeda-beda? Di process id 
[089731] butuh waktu sampai 3 menit (karena query ke 3 DNS Server) sampai 
mendapat Result:none . Di proses id [089874] hanya butuh waktu 20 detik. Apa 
yang menyebabkan berbeda-beda dan bagaimana untuk menyeragamkan prosesnya 
supaya cepat seperti di proses id [089874]?

Demikian disampaikan dan terima kasih banyak atas perhatiannya.

Best Regards,

Bonar Gultom


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