Email infrastructure of tff-forum.de
According to Live Direct Marketing's daily DNS scan (September 7, 2026), tff-forum.de (Tranco rank #162,602) points its inbound MX to Strato (DE) and authorizes Amazon SES in SPF. Its observed DMARC policy is p=reject. Across this dataset, 47% of DMARC publishers use an enforcing policy; this does not show where a specific message landed.
Last updated: .
| Mailbox provider (MX) | Strato (DE) |
|---|---|
| ESPs in SPF | Amazon SES |
| SaaS senders in SPF | none detected |
| DMARC policy | p=reject |
| DMARC record | v=DMARC1; p=reject |
| Tranco rank | #162,602 |
| Snapshot | 2026-09-07 (updated daily) |
Keep an eye on tff-forum.de
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Manage existing subscriptions →How tff-forum.de compares
Same daily dataset, three views: how its mailbox provider is trending, how strict DMARC is at its position in the list, and where its own policy sits among all DMARC publishers in the dataset.
Market share of Strato (DE)
DMARC enforced by list position
Policy maturity of all DMARC publishers
From observation to a useful check
- What was observed
- The DNS records and classifications in this snapshot.
- What it means
- MX describes inbound mail; SPF authorizes senders.
- What is unknown
- The actual sending IP, nested SPF dependencies, inbox placement and commercial relationships. MTA-STS, TLS-RPT and BIMI adoption are not measured.
- Next check
- Verify current DNS and test a real message: run an inbox placement test.
DNS records
Source: OpenINTEL / Tranco. Capture: 2026-09-07. These are answers from the measurement vantage point, not a live DNS check. TTL is the observed cache lifetime in seconds.
tff-forum.de · A — Answer records observed
IPv4 addresses for this name. They do not identify the mail server or prove a hosting migration.
Query observed at: 2026-09-07T00:51:20Z.
Response code: 0.
- tff-forum.de · A · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
104.26.4.144 - tff-forum.de · A · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
104.26.5.144 - tff-forum.de · A · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
172.67.72.112
tff-forum.de · AAAA — Answer records observed
IPv6 addresses for this name. An address record does not test service availability.
Query observed at: 2026-09-07T00:51:20Z.
Response code: 0.
- tff-forum.de · AAAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
2606:4700:20::681a:490 - tff-forum.de · AAAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
2606:4700:20::681a:590 - tff-forum.de · AAAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
2606:4700:20::ac43:4870
tff-forum.de · NS — Answer records observed
Name servers listed for the DNS zone.
Query observed at: 2026-09-07T00:51:20Z.
Response code: 0.
- tff-forum.de · NS · TTL 86400 s · 2026-09-07T00:51:20Z · AD=0
alex.ns.cloudflare.com. - tff-forum.de · NS · TTL 86400 s · 2026-09-07T00:51:20Z · AD=0
maeve.ns.cloudflare.com.
tff-forum.de · MX — Answer records observed
Servers named to receive mail. Lower preference numbers are tried first.
Query observed at: 2026-09-07T00:51:20Z.
Response code: 0.
- tff-forum.de · MX · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
5 smtpin.rzone.de.
tff-forum.de · SOA — Answer records observed
Zone administration data. The serial is a version number, not a creation date or clock.
Query observed at: 2026-09-07T00:51:20Z.
Response code: 0.
- tff-forum.de · SOA · TTL 1800 s · 2026-09-07T00:51:20Z · AD=0
expire=604800; minimum=1800; mname=alex.ns.cloudflare.com.; refresh=10000; retry=2400; rname=dns.cloudflare.com.; serial=2412846857
tff-forum.de · CAA — Answer records observed
Rules for certificate issuance. These do not show whether an existing certificate is valid.
Query observed at: 2026-09-07T00:51:20Z.
Response code: 0.
- tff-forum.de · CAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
flags=0; tag=issue; value="awstrust.com" - tff-forum.de · CAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
flags=0; tag=issue; value="comodoca.com" - tff-forum.de · CAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
flags=0; tag=issue; value="digicert.com; cansignhttpexchanges=yes" - tff-forum.de · CAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
flags=0; tag=issue; value="letsencrypt.org" - tff-forum.de · CAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
flags=0; tag=issue; value="pki.goog; cansignhttpexchanges=yes" - tff-forum.de · CAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
flags=0; tag=issue; value="ssl.com" - tff-forum.de · CAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
flags=0; tag=issuewild; value="awstrust.com" - tff-forum.de · CAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
flags=0; tag=issuewild; value="comodoca.com" - tff-forum.de · CAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
flags=0; tag=issuewild; value="digicert.com; cansignhttpexchanges=yes" - tff-forum.de · CAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
flags=0; tag=issuewild; value="letsencrypt.org" - tff-forum.de · CAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
flags=0; tag=issuewild; value="pki.goog; cansignhttpexchanges=yes" - tff-forum.de · CAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
flags=0; tag=issuewild; value="ssl.com"
tff-forum.de · TXT — Answer records observed
Text records can publish mail policies, domain-control challenges or other data.
Query observed at: 2026-09-07T00:51:20Z.
Response code: 0.
SPF: authorized mail senders; not proof that mail was sent.
Raw TXT value
tff-forum.de · TXT · TTL 300 s · 2026-09-07T00:51:20Z · AD=0"v=spf1 include:amazonses.com include:_spf.strato.com ~all"
tff-forum.de · DNSKEY — Unknown: no conclusive answer in this capture
DNSSEC key, signature or denial-of-existence data observed in this response.
tff-forum.de · DS — Unknown: no conclusive answer in this capture
DNSSEC key, signature or denial-of-existence data observed in this response.
tff-forum.de · CDS — Unknown: no conclusive answer in this capture
DNSSEC key, signature or denial-of-existence data observed in this response.
tff-forum.de · CDNSKEY — Unknown: no conclusive answer in this capture
DNSSEC key, signature or denial-of-existence data observed in this response.
www.tff-forum.de · A — Answer records observed
IPv4 addresses for this name. They do not identify the mail server or prove a hosting migration.
Query observed at: 2026-09-07T00:51:20Z.
Response code: 0.
- www.tff-forum.de · A · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
104.26.4.144 - www.tff-forum.de · A · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
104.26.5.144 - www.tff-forum.de · A · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
172.67.72.112
www.tff-forum.de · AAAA — Answer records observed
IPv6 addresses for this name. An address record does not test service availability.
Query observed at: 2026-09-07T00:51:20Z.
Response code: 0.
- www.tff-forum.de · AAAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
2606:4700:20::681a:490 - www.tff-forum.de · AAAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
2606:4700:20::681a:590 - www.tff-forum.de · AAAA · TTL 300 s · 2026-09-07T00:51:20Z · AD=0
2606:4700:20::ac43:4870
_dmarc.tff-forum.de · TXT — Answer records observed
Text records can publish mail policies, domain-control challenges or other data.
Query observed at: 2026-09-07T00:51:20Z.
Response code: 0.
DMARC: published handling and reporting policy for authentication failures.
Raw TXT value
_dmarc.tff-forum.de · TXT · TTL 300 s · 2026-09-07T00:51:20Z · AD=0"v=DMARC1; p=reject"
DNSSEC records are shown only when returned. An unset AD flag is not proof that a zone is unsigned. MTA-STS, TLS-RPT, BIMI and arbitrary DKIM selectors are not measured here; their absence cannot be inferred.
Recorded DNS history
Registry presence: first seen 2026-04-28; last seen 2026-09-07. These are appearances in our domain registry, not domain registration dates or earlier DNS values.
This history starts with saved RR captures. Provider market-share charts are aggregate context, not this domain’s DNS history. Dates identify observations; no continuous validity between them is implied. Equivalent RR states are combined, ignoring response TTL and capture-time changes. Up to 30 distinct RR states and 60 dated captures are retained within a per-domain byte limit.
No earlier different RR snapshot is available for comparison.
Available saved snapshots
2026-09-07 (equivalent state also recorded on 2026-09-05)
Each query below keeps its own observation date; unknown checks may retain older values.
_dmarc.tff-forum.de · TXT
2026-09-07 — Answer records observed
DMARC: published handling and reporting policy for authentication failures.
Raw TXT value
_dmarc.tff-forum.de · TXT"v=DMARC1; p=reject"
tff-forum.de · A
2026-09-07 — Answer records observed
- tff-forum.de · A
104.26.4.144 - tff-forum.de · A
104.26.5.144 - tff-forum.de · A
172.67.72.112
tff-forum.de · AAAA
2026-09-07 — Answer records observed
- tff-forum.de · AAAA
2606:4700:20::681a:490 - tff-forum.de · AAAA
2606:4700:20::681a:590 - tff-forum.de · AAAA
2606:4700:20::ac43:4870
tff-forum.de · CAA
2026-09-07 — Answer records observed
- tff-forum.de · CAA
flags=0; tag=issue; value="awstrust.com" - tff-forum.de · CAA
flags=0; tag=issue; value="comodoca.com" - tff-forum.de · CAA
flags=0; tag=issue; value="digicert.com; cansignhttpexchanges=yes" - tff-forum.de · CAA
flags=0; tag=issue; value="letsencrypt.org" - tff-forum.de · CAA
flags=0; tag=issue; value="pki.goog; cansignhttpexchanges=yes" - tff-forum.de · CAA
flags=0; tag=issue; value="ssl.com" - tff-forum.de · CAA
flags=0; tag=issuewild; value="awstrust.com" - tff-forum.de · CAA
flags=0; tag=issuewild; value="comodoca.com" - tff-forum.de · CAA
flags=0; tag=issuewild; value="digicert.com; cansignhttpexchanges=yes" - tff-forum.de · CAA
flags=0; tag=issuewild; value="letsencrypt.org" - tff-forum.de · CAA
flags=0; tag=issuewild; value="pki.goog; cansignhttpexchanges=yes" - tff-forum.de · CAA
flags=0; tag=issuewild; value="ssl.com"
tff-forum.de · MX
2026-09-07 — Answer records observed
- tff-forum.de · MX
5 smtpin.rzone.de
tff-forum.de · NS
2026-09-07 — Answer records observed
- tff-forum.de · NS
alex.ns.cloudflare.com - tff-forum.de · NS
maeve.ns.cloudflare.com
tff-forum.de · SOA
2026-09-07 — Answer records observed
- tff-forum.de · SOA
expire=604800; minimum=1800; mname=alex.ns.cloudflare.com; refresh=10000; retry=2400; rname=dns.cloudflare.com; serial=2412846857
tff-forum.de · TXT
2026-09-07 — Answer records observed
SPF: authorized mail senders; not proof that mail was sent.
Raw TXT value
tff-forum.de · TXT"v=spf1 include:amazonses.com include:_spf.strato.com ~all"
www.tff-forum.de · A
2026-09-07 — Answer records observed
- www.tff-forum.de · A
104.26.4.144 - www.tff-forum.de · A
104.26.5.144 - www.tff-forum.de · A
172.67.72.112
www.tff-forum.de · AAAA
2026-09-07 — Answer records observed
- www.tff-forum.de · AAAA
2606:4700:20::681a:490 - www.tff-forum.de · AAAA
2606:4700:20::681a:590 - www.tff-forum.de · AAAA
2606:4700:20::ac43:4870
Changes to tff-forum.de
No entry for this domain appears in the current public change feed. The feed is a selected sample, so this does not establish that its DNS stayed unchanged.
Start monitoring to build a history from your first check, or explore observed changes across the dataset.
SPF diagnostics
Static observations from the published SPF record. No nested include or redirect dependencies were evaluated. The actual sending IP and evaluation path are needed to assess the RFC 7208 limit of 10 DNS-dependent terms.
Modern mail security across the dataset
The required DNS labels are not queried. Adoption is unknown for this domain and for the population. Apex TXT anomalies are listed separately in the security posture report.
Reverse DNS of inbound MX hosts
These are separately dated observations of inbound MX addresses. They do not identify the actual sending IP. To assess outbound mail, check current forward and reverse DNS of the actual sending IP; FCrDNS and delivery were not measured here.
smtpin.rzone.de
PTR records were observed for all returned addresses of this MX.
DNS attempt: 2026-09-07 05:30:17 UTC. 2 of 2 addresses queried; 2 definite address results in the saved observation.
| Observed IP | Observed PTR names | DNS observation |
|---|---|---|
2a01:238:20a:202:50f0::1097 | smtpin.rzone.de | PTR observed |
81.169.145.97 | smtpin.rzone.de | PTR observed |
Observed PTR names are outside this domain. Name relationships are not a forward-confirmed reverse DNS test.
Where tff-forum.de stands
The same snapshot cut by zone, by list position and by how alive the published policies are.
- At this list position the top three mailbox providers hold 53.9% of domains (Google Workspace, Microsoft 365, Unknown / Other).
- Across the dataset 25.1% of DMARC records are inert — policy does nothing and no reports are collected.
Context of .de
Most used sending platforms among 7,336 SPF-publishing domains in Germany: Mailjet (Sinch) 16.3% · Amazon SES 14.4% · Zendesk 10.3% · Brevo (ex-Sendinblue) 9.4%. tff-forum.de runs a stack that is typical for this zone.
How to interpret these observations
MX identifies the observed inbound mailbox or gateway. SPF includes identify services authorised to send for the domain. DMARC shows the published authentication policy. The dataset currently contains 3 populated signal groups for this page.
Observed deliverability context: based on the available observations, this page describes DNS configuration only. It does not represent a complete audit of tff-forum.de and does not prove that a particular message reaches the inbox or spam folder.
Frequently asked questions
What email provider does tff-forum.de use?
tff-forum.de uses Strato (DE) for inbound mail (detected from its primary MX record) as of September 7, 2026, per Live Direct Marketing's daily Tranco top-1M scan.
What ESP does tff-forum.de use?
tff-forum.de authorises Amazon SES in its SPF record as of September 7, 2026.
Does tff-forum.de enforce DMARC?
Yes — tff-forum.de publishes p=reject, the strictest DMARC policy (as of September 7, 2026).
Related domain statistics
Nearby domains in the Tranco ranking: thefabulous.co · oren-sarmats.ru · psx-place.com · laikas.lt
Browse provider data · Compare historical periods · Run an inbox placement test
Data: Email infrastructure of the Tranco top-1M, daily snapshot 2026-09-07, derived from OpenINTEL forward-DNS measurements. Cite with the date — records change daily.