C
qcom.com.vn
Score 78/100 · 1 failing, 5 warnings
Mail provider: larksuite.com
Check another domain Re-scan

Scanned 2 hours ago. Re-scan for a fresh result after a fix.

Issues to fix

Results

01Mail exchangers (MX)A
pass
3 MX record(s) found.
records
preferenceexchangettl
1mx1.larksuite.com600
5mx2.larksuite.com600
10mx3.larksuite.com600
02Mail providerA
info
Mail is handled by larksuite.com, a self-hosted or independent provider.
provider larksuite.com
03SPFA
pass
SPF record present.
record v=spf1 +include:spf.onlarksuite.com -all
pass
SPF uses 2 of the 10 permitted DNS lookups.
RFC 7208 §4.6.4
lookups 2
pass
-all default policy.
RFC 7208
04DKIMA
info
No DKIM selector found via common probes (no _domainkey subtree exists), the domain may use a custom selector.
RFC 6376 (updated by RFC 8553, RFC 8616)
05DMARCC
fail
No DMARC record: receivers have no policy for handling unauthenticated mail.
RFC 9989
06DNS healthB
warn
MX host mx3.larksuite.com (122.14.230.154) has no PTR record, many receivers reject senders without reverse DNS.
host mx3.larksuite.com
ip 122.14.230.154
warn
MX host mx3.larksuite.com (101.126.58.223) has no PTR record, many receivers reject senders without reverse DNS.
host mx3.larksuite.com
ip 101.126.58.223
pass
4 nameservers published.
RFC 2182
count 4
pass
SOA timers are sane.
RFC 1912
mname ns1.zonedns.vn.
rname root.qcom.com.vn.
refresh 1200
retry 600
expire 1209600
minimum 3600
info
Zone is not DNSSEC-signed.
RFC 9364
07BlacklistsA
pass
18.139.153.173 is not listed on SpamCop.
target 18.139.153.173
list SpamCop
pass
101.126.58.223 is not listed on SpamCop.
target 101.126.58.223
list SpamCop
pass
122.14.230.154 is not listed on SpamCop.
target 122.14.230.154
list SpamCop
pass
101.126.58.223 is not listed on GBUdb Truncate.
target 101.126.58.223
list GBUdb Truncate
pass
18.139.153.173 is not listed on Spamhaus ZEN.
target 18.139.153.173
list Spamhaus ZEN
pass
122.14.230.154 is not listed on Spamhaus ZEN.
target 122.14.230.154
list Spamhaus ZEN
pass
101.126.58.223 is not listed on Spamhaus ZEN.
target 101.126.58.223
list Spamhaus ZEN
pass
qcom.com.vn is not listed on Spamhaus DBL.
target qcom.com.vn
list Spamhaus DBL
pass
qcom.com.vn is not listed on Spamhaus ZRD.
target qcom.com.vn
list Spamhaus ZRD
pass
18.139.153.173 is not listed on Spamhaus AuthBL.
target 18.139.153.173
list Spamhaus AuthBL
pass
18.139.153.173 is not listed on GBUdb Truncate.
target 18.139.153.173
list GBUdb Truncate
pass
122.14.230.154 is not listed on GBUdb Truncate.
target 122.14.230.154
list GBUdb Truncate
pass
101.126.58.223 is not listed on Spamhaus AuthBL.
target 101.126.58.223
list Spamhaus AuthBL
pass
122.14.230.154 is not listed on Spamhaus AuthBL.
target 122.14.230.154
list Spamhaus AuthBL
pass
18.139.153.173 is not listed on PSBL.
target 18.139.153.173
list PSBL
pass
101.126.58.223 is not listed on PSBL.
target 101.126.58.223
list PSBL
pass
122.14.230.154 is not listed on PSBL.
target 122.14.230.154
list PSBL
08Bulk sending readinessA
warn
Partial bulk-sender setup, missing DKIM, DMARC. Gmail/Yahoo and Microsoft require all three for 5,000+ messages/day.
spf true
dkim false
dmarc false
threshold 5,000 messages/day
info
One-click List-Unsubscribe is a message-level header. Verify by sending a test message.
09TLSA
info
No DANE/TLSA records. DANE is not deployed for these mail servers.
RFC 7672
hosts mx1.larksuite.com, mx2.larksuite.com, mx3.larksuite.com
pass
Negotiated TLSv1.2.
RFC 8996
tls_version TLSv1.2
host mx1.larksuite.com
pass
Certificate valid for 49 more day(s).
not_after 2026-10-23T23:59:59+00:00
host mx1.larksuite.com
pass
Certificate covers mx1.larksuite.com.
RFC 6125
names *.mail.larksuite.com, *.mail.bytedance.com, *.mail.feishu.cn, *.mail.tiktok.com, *.mail.larkoffice.com, *.mail.larkenterprise.com, *.feishu.cn, *.larksuite.com, *.larkoffice.com, *.larkenterprise.com, *.bytedance.com, *.tiktok.com
host mx1.larksuite.com
pass
Server presented a 2-certificate chain.
chain_len 2
host mx1.larksuite.com
10MTA-STSA
info
No MTA-STS policy. Inbound mail is delivered without enforced TLS.
RFC 8461
warn
No TLS-RPT reporting address. TLS delivery failures go unreported.
RFC 8460
11BIMIA
info
No BIMI record. No brand logo is published for inboxes with BIMI support.
BIMI draft
SMTP (live probe)
info
No DANE/TLSA records. DANE is not deployed for these mail servers.
RFC 7672
hosts mx1.larksuite.com, mx2.larksuite.com, mx3.larksuite.com
pass
3 of 3 MX host(s) reachable on port 25.
RFC 5321
reachable mx1.larksuite.com, mx2.larksuite.com, mx3.larksuite.com
unreachable (none)
warn
Greeting is 220 but announces no FQDN.
RFC 5321
banner 220 n126-036-051 ESMTP ready
info
Could not compare banner hostname to reverse DNS.
banner_fqdn
ptr ec2-18-139-153-173.ap-southeast-1.compute.amazonaws.com
pass
EHLO accepted with 1 extension(s).
RFC 5321
extensions 8BITMIME
info
Server does not advertise SMTPUTF8; internationalized (EAI) addresses may be rejected.
RFC 6531
info
Server does not advertise REQUIRETLS; senders cannot demand TLS-only delivery to this host.
RFC 8689
pass
STARTTLS is advertised in EHLO.
RFC 3207
pass
STARTTLS negotiated a working TLS session.
RFC 3207
tls_version TLSv1.2
pass
Negotiated TLSv1.2.
RFC 8996
tls_version TLSv1.2
host mx1.larksuite.com
pass
Certificate valid for 49 more day(s).
not_after 2026-10-23T23:59:59+00:00
host mx1.larksuite.com
pass
Certificate covers mx1.larksuite.com.
RFC 6125
names *.mail.larksuite.com, *.mail.bytedance.com, *.mail.feishu.cn, *.mail.tiktok.com, *.mail.larkoffice.com, *.mail.larkenterprise.com, *.feishu.cn, *.larksuite.com, *.larkoffice.com, *.larkenterprise.com, *.bytedance.com, *.tiktok.com
host mx1.larksuite.com
pass
Server presented a 2-certificate chain.
chain_len 2
host mx1.larksuite.com
pass
Server refused external relay, as expected.
RFC 5321
reply 550 verify address failed, User not found relay-test@example.com
pass
Server accepts the null sender (MAIL FROM:<>), so bounces and DSNs can be delivered.
RFC 5321
reply 250 2.0.0 OK

About this report

This report grades the email and DNS setup of qcom.com.vn against the relevant RFCs. Each check links to the standard behind the rule. A high grade means the common causes of spoofing and poor deliverability are covered. A grade is not a guarantee that every message reaches the inbox.

Frequently asked questions

What does the grade mean?
The grade summarizes how completely the domain implements the core email authentication and DNS standards. A and B mean the main protections (SPF, DKIM, DMARC, valid MX) are in place. Lower grades flag gaps that make spoofing easier or hurt deliverability. A missing MX record caps the grade at F, a weak SPF all-qualifier caps at D, and no DMARC caps at C.
How fresh is this report?
A report is a snapshot from when it was last scanned, kept as a shareable link. If you are fixing your setup, use the Re-scan button to run every check live again.
Why is the SMTP section still loading?
The live SMTP probe connects to the mail servers from a dedicated prober, which takes a few seconds and runs separately from the DNS checks. The results stream in when ready. If SMTP was not requested for this report, that section stays empty.
I own this domain and want to stop scan.mx checking it.
Domain owners can block scanning by publishing a DNS TXT record; see the opt-out page.

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