Dari hasil test saya barusan, yang bermasalah adalah setting SOA DNS yang tidak
(lagi) terdaftar di internet sehingga internet node (terkadang) kesulitan (lama)
resolve.

$ host -t soa ciputra.co.id
ciputra.co.id has SOA record masterdns.ciputra.co.id. root.ciputra.co.id.
20171206 3600 1800 604800 3600

$ host -t a masterdns.ciputra.co.id
Host masterdns.ciputra.co.id not found: 3(NXDOMAIN)

$ host -t a masterdns.ciputra.co.id ns1.ciputragroup.com
Using domain server:
Name: ns1.ciputragroup.com
Address: 202.51.104.180#53
Aliases:

Host masterdns.ciputra.co.id not found: 3(NXDOMAIN)

Diperbaiki saja setting Name Server, khususnya SOA DNS nya.

Terima kasih bantuannya pak, saya sudah coba perbaiki setting NS nya, dan 
sepertinya sudah ada peningkatan di waktu penerimaan email.

Pertanyaan berikutnya bagaimana mem bypass spf verification dari sender/domain 
tertentu, karena saya lihat di log cukup memakan waktu juga untuk memproses 
emailnya (+60 detik utk setiap dns response exceeded). berikut ini contoh log 
smtp-in nya

Wed 2021-02-03 14:15:16.721: [569442] Session 569442; child 0113
Wed 2021-02-03 14:15:16.721: [569442] Accepting SMTP connection from 
209.85.160.174:41597 to 172.16.10.10:25
Wed 2021-02-03 14:15:16.722: [569442] --> 220 mail.ciputra.co.id ESMTP MDaemon 
17.5.3; Wed, 03 Feb 2021 14:15:16 +0700
Wed 2021-02-03 14:15:16.960: [569442] <-- EHLO mail-qt1-f174.google.com
Wed 2021-02-03 14:15:16.961: [569442] Performing SPF lookup 
(mail-qt1-f174.google.com / 209.85.160.174)
Wed 2021-02-03 14:16:16.961: [569442] *  DNS: 60 second wait for DNS response 
exceeded (DNS Server: 8.8.8.8)
Wed 2021-02-03 14:17:16.962: [569442] *  DNS: 60 second wait for DNS response 
exceeded (DNS Server: 8.8.4.4)
Wed 2021-02-03 14:18:17.055: [569442] *  DNS: 60 second wait for DNS response 
exceeded (DNS Server: 1.1.1.1)
Wed 2021-02-03 14:18:47.072: [569442] *  Result: none; no SPF record in DNS
Wed 2021-02-03 14:18:47.072: [569442] ---- End SPF results
Wed 2021-02-03 14:18:47.072: [569442] --> 250-mail.ciputra.co.id Hello 
mail-qt1-f174.google.com [209.85.160.174], pleased to meet you
Wed 2021-02-03 14:18:47.072: [569442] --> 250-ETRN
Wed 2021-02-03 14:18:47.072: [569442] --> 250-AUTH LOGIN CRAM-MD5 PLAIN
Wed 2021-02-03 14:18:47.072: [569442] --> 250-8BITMIME
Wed 2021-02-03 14:18:47.072: [569442] --> 250-ENHANCEDSTATUSCODES
Wed 2021-02-03 14:18:47.072: [569442] --> 250-STARTTLS
Wed 2021-02-03 14:18:47.072: [569442] --> 250 SIZE 25600000
Wed 2021-02-03 14:18:47.311: [569442] <-- STARTTLS
Wed 2021-02-03 14:18:47.311: [569442] --> 220 2.7.0 Ready to start TLS
Wed 2021-02-03 14:18:47.793: [569442] SSL negotiation successful (TLS 1.2, 256 
bit key exchange, 256 bit AES encryption)
Wed 2021-02-03 14:18:48.034: [569442] <-- EHLO mail-qt1-f174.google.com
Wed 2021-02-03 14:18:48.034: [569442] Performing SPF lookup 
(mail-qt1-f174.google.com / 209.85.160.174)
Wed 2021-02-03 14:19:48.034: [569442] *  DNS: 60 second wait for DNS response 
exceeded (DNS Server: 8.8.8.8)
Wed 2021-02-03 14:19:48.203: [569442] *  Result: none; no SPF record in DNS
Wed 2021-02-03 14:19:48.203: [569442] ---- End SPF results
Wed 2021-02-03 14:19:48.203: [569442] --> 250-mail.ciputra.co.id Hello 
mail-qt1-f174.google.com [209.85.160.174], pleased to meet you
Wed 2021-02-03 14:19:48.203: [569442] --> 250-ETRN
Wed 2021-02-03 14:19:48.203: [569442] --> 250-AUTH LOGIN CRAM-MD5 PLAIN
Wed 2021-02-03 14:19:48.203: [569442] --> 250-8BITMIME
Wed 2021-02-03 14:19:48.203: [569442] --> 250-ENHANCEDSTATUSCODES
Wed 2021-02-03 14:19:48.203: [569442] --> 250 SIZE 25600000
Wed 2021-02-03 14:19:48.438: [569442] <-- MAIL FROM:<bonar.gul...@gmail.com> 
SIZE=2710
Wed 2021-02-03 14:19:48.438: [569442] Performing PTR lookup 
(174.160.85.209.IN-ADDR.ARPA)
Wed 2021-02-03 14:19:48.454: [569442] *  D=174.160.85.209.IN-ADDR.ARPA 
TTL=(328) PTR=[mail-qt1-f174.google.com]
Wed 2021-02-03 14:19:48.472: [569442] *  D=mail-qt1-f174.google.com TTL=(285) 
A=[209.85.160.174]
Wed 2021-02-03 14:19:48.472: [569442] ---- End PTR results
Wed 2021-02-03 14:19:48.472: [569442] Performing IP lookup 
(mail-qt1-f174.google.com)
Wed 2021-02-03 14:19:48.489: [569442] *  D=mail-qt1-f174.google.com TTL=(356) 
A=[209.85.160.174]
Wed 2021-02-03 14:19:48.489: [569442] ---- End IP lookup results
Wed 2021-02-03 14:19:48.490: [569442] Performing IP lookup (gmail.com)
Wed 2021-02-03 14:19:48.506: [569442] *  D=gmail.com TTL=(2) A=[172.217.194.19]
Wed 2021-02-03 14:19:48.506: [569442] *  D=gmail.com TTL=(2) A=[172.217.194.17]
Wed 2021-02-03 14:19:48.506: [569442] *  D=gmail.com TTL=(2) A=[172.217.194.18]
Wed 2021-02-03 14:19:48.506: [569442] *  D=gmail.com TTL=(2) A=[172.217.194.83]
Wed 2021-02-03 14:19:48.523: [569442] *  P=005 S=004 D=gmail.com TTL=(46) 
MX=[gmail-smtp-in.l.google.com]
Wed 2021-02-03 14:19:48.523: [569442] *  P=010 S=000 D=gmail.com TTL=(46) 
MX=[alt1.gmail-smtp-in.l.google.com]
Wed 2021-02-03 14:19:48.523: [569442] *  P=020 S=001 D=gmail.com TTL=(46) 
MX=[alt2.gmail-smtp-in.l.google.com]
Wed 2021-02-03 14:19:48.523: [569442] *  P=030 S=002 D=gmail.com TTL=(46) 
MX=[alt3.gmail-smtp-in.l.google.com]
Wed 2021-02-03 14:19:48.523: [569442] *  P=040 S=003 D=gmail.com TTL=(46) 
MX=[alt4.gmail-smtp-in.l.google.com]
Wed 2021-02-03 14:19:48.541: [569442] *  D=gmail-smtp-in.l.google.com TTL=(1) 
A=[74.125.130.27]
Wed 2021-02-03 14:19:48.557: [569442] *  D=alt1.gmail-smtp-in.l.google.com 
TTL=(0) A=[74.125.28.27]
Wed 2021-02-03 14:19:48.574: [569442] *  D=alt2.gmail-smtp-in.l.google.com 
TTL=(1) A=[74.125.137.27]
Wed 2021-02-03 14:19:48.593: [569442] *  D=alt3.gmail-smtp-in.l.google.com 
TTL=(1) A=[173.194.199.27]
Wed 2021-02-03 14:19:48.609: [569442] *  D=alt4.gmail-smtp-in.l.google.com 
TTL=(4) A=[209.85.145.27]
Wed 2021-02-03 14:19:48.609: [569442] ---- End IP lookup results
Wed 2021-02-03 14:19:48.611: [569442] --> 250 2.1.0 Sender OK
Wed 2021-02-03 14:19:48.845: [569442] <-- RCPT TO:<bonar.gul...@ciputra.co.id>
Wed 2021-02-03 14:19:48.850: [569442] Performing DNS-BL lookup (209.85.160.174 
- connecting IP)
Wed 2021-02-03 14:19:48.871: [569442] *  zen.spamhaus.org - passed
Wed 2021-02-03 14:19:48.871: [569442] ---- End DNS-BL results
Wed 2021-02-03 14:19:48.873: [569442] --> 250 2.1.5 Recipient OK
Wed 2021-02-03 14:19:49.107: [569442] <-- DATA
Wed 2021-02-03 14:19:49.108: [569442] Creating temp file (SMTP): 
d:\mdaemon\queues\temp\md50001432743.tmp
Wed 2021-02-03 14:19:49.108: [569442] --> 354 Enter mail, end with <CRLF>.<CRLF>
Wed 2021-02-03 14:19:49.347: [569442] Message size: 2710 bytes
Wed 2021-02-03 14:19:49.349: [569442] Performing DKIM lookup
Wed 2021-02-03 14:19:49.349: [569442] *  File: 
d:\mdaemon\queues\temp\md50001432743.tmp
Wed 2021-02-03 14:19:49.349: [569442] *  Message-ID: 
<CAJZr3oROAQoS2-L61Rf9=ihq_0s7f2f-7yyyxkzjxcsofni...@mail.gmail.com>
Wed 2021-02-03 14:19:51.048: [569442] * DKIM-Signature 1: v=1; a=rsa-sha256; 
c=relaxed/relaxed; d=gmail.com; s=20161025; <some tags are not logged>
Wed 2021-02-03 14:19:51.048: [569442] *    Verification result: 
DKIM_SELECTOR_DNS_PERM_FAILURE
Wed 2021-02-03 14:19:51.048: [569442] *  Result: neutral
Wed 2021-02-03 14:19:51.048: [569442] ---- End DKIM results
Wed 2021-02-03 14:19:51.058: [569442] Passing message through Spam Filter 
(Size: 2710)...
Wed 2021-02-03 14:19:51.136: [569442] *  0.0 FREEMAIL_FROM Sender email is 
commonly abused enduser mail provider
Wed 2021-02-03 14:19:51.136: [569442] *      (bonar.gultom[at]gmail.com)
Wed 2021-02-03 14:19:51.136: [569442] *  0.0 HTML_MESSAGE BODY: HTML included 
in message
Wed 2021-02-03 14:19:51.136: [569442] ---- End SpamAssassin results
Wed 2021-02-03 14:19:51.136: [569442] Spam Filter score/req: 0.00/10.0
Wed 2021-02-03 14:19:51.375: [569442] Message creation successful: 
d:\mdaemon\queues\inbound\md50012230487.msg
Wed 2021-02-03 14:19:51.375: [569442] --> 250 2.6.0 Ok, message saved 
<Message-ID: 
<CAJZr3oROAQoS2-L61Rf9=ihq_0s7f2f-7yyyxkzjxcsofni...@mail.gmail.com>>
Wed 2021-02-03 14:19:51.379: [569442] <-- QUIT
Wed 2021-02-03 14:19:51.379: [569442] --> 221 2.0.0 See ya in cyberspace
Wed 2021-02-03 14:19:51.380: [569442] SMTP session successful (Bytes in/out: 
3895/6186)

saya sudah mengisi spf exception list dengan isian sbb:
*@gmail.com
*@google.com
*@outlook.com
apakah sudah sesuai pak?

Terima kasih banyak atas bantuannya.


Best Regards,

Bonar Gultom


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