C
Scanned 13 days ago. Re-scan for a fresh result after a fix.
Issues to fix
- failNo SPF record: receivers cannot verify which hosts may send mail for this domain.→
- warnPartial bulk-sender setup, missing SPF, DKIM. Gmail/Yahoo and Microsoft require all three for 5,000+ messages/day.→
- warnLow MX TTL (150s), frequent re-lookups add latency and load.→
- warnNo TLS-RPT reporting address. TLS delivery failures go unreported.→
Results
01Mail exchangers (MX)A
pass
1 MX record(s) found.
records
| preference | exchange | ttl |
|---|---|---|
| 5 | smtp.rzone.de | 150 |
info
Only one MX host, a secondary MX adds delivery resilience.
warn
Low MX TTL (150s), frequent re-lookups add latency and load.
ttls 150
02Mail providerA
info
Mail is handled by rzone.de, a self-hosted or independent provider.
provider rzone.de
03SPFC
fail
No SPF record: receivers cannot verify which hosts may send mail for this domain.
04DKIMA
info
No DKIM selector found via common probes (a _domainkey subtree exists but no common selector matched), the domain may use a custom selector.
05DMARCA
pass
DMARC record present.
record v=DMARC1;p=reject;
pass
Enforcing policy p=reject.
p reject
rua false
06DNS healthA
07BlacklistsA
info
IPv6 MX addresses are not checked against IP DNSBLs.
pass
81.169.145.98 is not listed on SpamCop.
target 81.169.145.98
list SpamCop
pass
mailmus.nl is not listed on Spamhaus DBL.
target mailmus.nl
list Spamhaus DBL
pass
81.169.145.98 is not listed on Spamhaus ZEN.
target 81.169.145.98
list Spamhaus ZEN
pass
mailmus.nl is not listed on Spamhaus ZRD.
target mailmus.nl
list Spamhaus ZRD
pass
81.169.145.98 is not listed on Spamhaus AuthBL.
target 81.169.145.98
list Spamhaus AuthBL
pass
81.169.145.98 is not listed on GBUdb Truncate.
target 81.169.145.98
list GBUdb Truncate
pass
81.169.145.98 is not listed on PSBL.
target 81.169.145.98
list PSBL
08Bulk sending readinessA
warn
Partial bulk-sender setup, missing SPF, DKIM. Gmail/Yahoo and Microsoft require all three for 5,000+ messages/day.
spf false
dkim false
dmarc true
threshold 5,000 messages/day
info
One-click List-Unsubscribe is a message-level header. Verify by sending a test message.
09TLSA
pass
DANE/TLSA published and DNSSEC-signed for smtp.rzone.de.
host smtp.rzone.de
usage 3
selector 1
matchingType 1
profileNote 3 1 1 (recommended)
certMatch certificate-to-TLSA matching is verified by the SMTP probe against the live server certificate
pass
Negotiated TLSv1.3.
tls_version TLSv1.3
host smtp.rzone.de
pass
Certificate valid for 100 more day(s).
not_after 2027-01-11T23:59:59+00:00
host smtp.rzone.de
pass
Certificate covers smtp.rzone.de.
names smtp.rzone.de
host smtp.rzone.de
pass
Server presented a 2-certificate chain.
chain_len 2
host smtp.rzone.de
10MTA-STSA
11BIMIA
info
No BIMI record. No brand logo is published for inboxes with BIMI support.
BIMI draft
12Email Verification Protocol
info
No Email Verification Protocol record. Browsers cannot verify addresses at this domain without sending an email.
EVP draft
SMTP (live probe)
pass
DANE/TLSA published and DNSSEC-signed for smtp.rzone.de.
host smtp.rzone.de
usage 3
selector 1
matchingType 1
profileNote 3 1 1 (recommended)
certMatch certificate-to-TLSA matching is verified by the SMTP probe against the live server certificate
pass
1 of 1 MX host(s) reachable on port 25.
reachable smtp.rzone.de
unreachable (none)
pass
Greeting is 220 with a hostname (smtp.rzone.de).
banner 220 smtp.rzone.de ESMTP RZmta 55.6.2 ready (mi52)
pass
Banner hostname matches reverse DNS.
banner_fqdn smtp.rzone.de
ptr smtp.rzone.de
pass
EHLO accepted with 9 extension(s).
extensions 8BITMIME, DELIVERBY, ENHANCEDSTATUSCODES, HELP, LIMITS, PIPELINING, REQUIRETLS, SIZE, X-RZGMTAEXTENSIONS
info
Server does not advertise SMTPUTF8; internationalized (EAI) addresses may be rejected.
pass
Server advertises REQUIRETLS, so senders can require TLS for a message instead of falling back to cleartext.
pass
Server advertises LIMITS, so senders can read its recipient and size ceilings up front.
pass
STARTTLS is advertised in EHLO.
pass
STARTTLS negotiated a working TLS session.
tls_version TLSv1.3
pass
Negotiated TLSv1.3.
tls_version TLSv1.3
host smtp.rzone.de
pass
Certificate valid for 100 more day(s).
not_after 2027-01-11T23:59:59+00:00
host smtp.rzone.de
pass
Certificate covers smtp.rzone.de.
names smtp.rzone.de
host smtp.rzone.de
pass
Server presented a 2-certificate chain.
chain_len 2
host smtp.rzone.de
pass
Server refused external relay, as expected.
reply 550 5.7.0 <relay-test@example.com> is blocked due to complaints (MBL-R) [MSG0023]
pass
Server accepts the null sender (MAIL FROM:<>), so bounces and DSNs can be delivered.
reply 250 2.1.0 Sender ok
About this report
This report grades the email and DNS setup of mailmus.nl 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.