A
seralu.com
Score 99/100 · 0 failing, 4 warnings
Mail provider: mailinblack.com
Check another domain Re-scan

Scanned 4 hours ago. Re-scan for a fresh result after a fix.

Issues to fix

Results

01Mail exchangers (MX)A
pass
1 MX record(s) found.
records
preferenceexchangettl
5mx-mibc-fr-01.mailinblack.com3600
info
Only one MX host, a secondary MX adds delivery resilience.
warn
All MX hosts resolve to a single IP, no address-level redundancy.
ip 40.89.148.181
02Mail providerA
info
Mail is handled by mailinblack.com, a self-hosted or independent provider.
provider mailinblack.com
03SPFA
pass
SPF record present.
record v=spf1 include:spf.protection.outlook.com include:spf.mailinblack.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
warn
Selector selector1 key is ~1024-bit, rotate to 2048-bit.
RFC 8301
selector selector1
record v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQ…IDAQAB; n=1024,1462393708,1478291308
bits 1024
info
DKIM2 reuses these same selector._domainkey records and advertises no capability, so support cannot be detected from DNS. The 1 published key(s) carry over as they are. Adding an Ed25519 key (RFC 8463) prepares for it.
draft-ietf-dkim-dkim2-spec
keys 1
ed25519 false
05DMARCA
pass
DMARC record present.
record v=DMARC1; p=quarantine; rua=mailto:dmarc@seralu.com; fo=1
pass
Enforcing policy p=quarantine.
RFC 9989
p quarantine
rua true
06DNS healthA
warn
MX host mx-mibc-fr-01.mailinblack.com (40.89.148.181) has no PTR record, many receivers reject senders without reverse DNS.
host mx-mibc-fr-01.mailinblack.com
ip 40.89.148.181
pass
2 nameservers published.
RFC 2182
count 2
pass
SOA timers are sane.
RFC 1912
mname pdns1.idline.fr.
rname postmaster.seralu.com.
refresh 86400
retry 21600
expire 3600000
minimum 86400
info
Zone is not DNSSEC-signed.
RFC 9364
07BlacklistsA
pass
40.89.148.181 is not listed on SpamCop.
target 40.89.148.181
list SpamCop
pass
seralu.com is not listed on Spamhaus ZRD.
target seralu.com
list Spamhaus ZRD
pass
40.89.148.181 is not listed on Spamhaus AuthBL.
target 40.89.148.181
list Spamhaus AuthBL
pass
40.89.148.181 is not listed on PSBL.
target 40.89.148.181
list PSBL
pass
40.89.148.181 is not listed on GBUdb Truncate.
target 40.89.148.181
list GBUdb Truncate
pass
seralu.com is not listed on Spamhaus DBL.
target seralu.com
list Spamhaus DBL
pass
40.89.148.181 is not listed on Spamhaus ZEN.
target 40.89.148.181
list Spamhaus ZEN
08Bulk sending readinessA
pass
SPF, DKIM and DMARC are all present: the domain meets the Gmail/Yahoo and Microsoft bulk-sender authentication requirements (5,000+ messages/day).
spf true
dkim true
dmarc true
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 mx-mibc-fr-01.mailinblack.com
pass
Negotiated TLSv1.3.
RFC 8996
tls_version TLSv1.3
host mx-mibc-fr-01.mailinblack.com
pass
Certificate valid for 97 more day(s).
not_after 2026-12-10T23:59:59+00:00
host mx-mibc-fr-01.mailinblack.com
pass
Certificate covers mx-mibc-fr-01.mailinblack.com.
RFC 6125
names *.mailinblack.com, mailinblack.com
host mx-mibc-fr-01.mailinblack.com
pass
Server presented a 2-certificate chain.
chain_len 2
host mx-mibc-fr-01.mailinblack.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 mx-mibc-fr-01.mailinblack.com
pass
1 of 1 MX host(s) reachable on port 25.
RFC 5321
reachable mx-mibc-fr-01.mailinblack.com
unreachable (none)
pass
Greeting is 220 with a hostname (mx03-mibc-fr-01.mailinblack.com).
RFC 5321
banner 220 mx03-mibc-fr-01.mailinblack.com ESMTP
info
Could not compare banner hostname to reverse DNS.
banner_fqdn mx03-mibc-fr-01.mailinblack.com
ptr
pass
EHLO accepted with 10 extension(s).
RFC 5321
extensions 8BITMIME, AUTH, AUTH=PLAIN, CHUNKING, DSN, ENHANCEDSTATUSCODES, ETRN, PIPELINING, SIZE, SMTPUTF8
pass
Server advertises SMTPUTF8, so it accepts internationalized (EAI) email addresses.
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 TLSv1.3
pass
Negotiated TLSv1.3.
RFC 8996
tls_version TLSv1.3
host mx-mibc-fr-01.mailinblack.com
pass
Certificate valid for 97 more day(s).
not_after 2026-12-10T23:59:59+00:00
host mx-mibc-fr-01.mailinblack.com
pass
Certificate covers mx-mibc-fr-01.mailinblack.com.
RFC 6125
names *.mailinblack.com, mailinblack.com
host mx-mibc-fr-01.mailinblack.com
pass
Server presented a 2-certificate chain.
chain_len 2
host mx-mibc-fr-01.mailinblack.com
pass
Server refused external relay, as expected.
RFC 5321
reply 554 5.7.1 <relay-test@example.com>: Relay access denied
pass
Server accepts the null sender (MAIL FROM:<>), so bounces and DSNs can be delivered.
RFC 5321
reply 250 2.1.0 Ok

About this report

This report grades the email and DNS setup of seralu.com 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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