merkurist.de

Checked 21 October 2026, 23:22 UTC · via 8.8.8.8
✗Problems found
22 passed 6 warnings 1 failed 1 info

SPF

pass

SPF record published

Found

Record
v=spf1 mx ip4:159.135.136.4 ip4:87.253.238.134 ip4:159.135.138.235 ip4:159.135.138.236 ip4:159.135.138.237 ip4:159.135.138.238 ip4:159.135.141.254 ip4:159.135.138.239 ip4:159.135.141.255 ip4:159.135.137.167 ip4:159.135.137.175 ip4:159.135.137.168 include:spf.mailjet.com include:_spf.perfora.net include:_spf-eu.ionos.com include:spf.protection.outlook.com include:_spf.de.seppmail.cloud include:spf.fidion.de ~all
DNS lookups
7 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 7 of 10 DNS lookups #2
    SPF record needs 7 DNS lookups (limit is 10).
  • ✓ Ends with ~all #3
    SPF record properly uses ~all to restrict unauthorized senders.
  • ✓ Record published #6
    SPF record exists for this domain.
  • ✓ Single record #16
    Exactly one SPF record is published.
  • ✓ Valid syntax #25
    All SPF mechanisms and modifiers are valid.
  • ✓ No void lookups #26
    All include/redirect targets exist.
  • ✓ No overly broad IP ranges #27
    All ip4/ip6 ranges are narrow enough.

DMARC

fail

p=none (_dmarc.merkurist.de)

Found

Record
v=DMARC1; p=none; rua=mailto:dmarc@fidion.de
Found at
_dmarc.merkurist.de
External report address
mailto:dmarc@fidion.de (not authorized)
TagValueMeaning
vDMARC1Version
pnonePolicy
ruamailto:dmarc@fidion.deAggregate report addresses

Checks

  • ✗
    Policy: none (monitoring only)
    DMARC policy is set to 'none', which only monitors but doesn't protect against spoofing. Consider upgrading to 'quarantine' or ideally 'reject'.
    #4
  • ✓ Record published #5
    DMARC record exists for this domain.
  • ✓ Valid syntax #17
    DMARC record syntax is valid.
  • ✓ Aggregate reports enabled #19
    Aggregate reports are sent to: mailto:dmarc@fidion.de
  • !
    Report address not authorized
    These report addresses are in another domain that has not agreed to receive your reports, so receivers will not send them: mailto:dmarc@fidion.de (needs merkurist.de._report._dmarc.fidion.de). Ask the report provider to publish the record, or check the address.
    #29

DKIM

pass

Selectors: default, selector1, selector2

Found

Selectors
default, selector1, selector2
_domainkey
NOERROR
SelectorKeyFlags
defaultRSA 2048 bits
selector1RSA 2048 bits
selector2RSA 2048 bits

Checks

  • ✓ Keys found: default, selector1, selector2 #7
    DKIM keys found for this domain with selectors: default, selector1, selector2
  • ✓ Strong keys #23
    DKIM keys are strong enough: default: RSA 2048 bits; selector1: RSA 2048 bits; selector2: RSA 2048 bits.
  • ✓ No problematic flags #24
    No keys in test mode, revoked, or limited to SHA-1.

DNSSEC

warn

Not signed

Found

DNSKEY records
No (0)
DS at parent
No

Checks

  • !
    Not enabled
    DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.
    #8

MX

warn

1 mail server

Found

PriorityHostRecordsReverse DNS
10merkurist-de.gate.seppmail.cloudA 49.12.23.112 A 37.49.152.140 A 167.233.8.136 AAAA 2a04:d480:4400:11:200:5eff:fe00:1e3 AAAA 2a01:4f8:c011:544::1 AAAA 2a01:4f8:1c1d:6b8::1gate.de.seppmail.cloud ✓ gate.de.seppmail.cloud ✓ gate.de.seppmail.cloud ✓ no PTR gate.de.seppmail.cloud ✓ gate.de.seppmail.cloud ✓

Checks

  • ✓ 1 MX record #9
    Found 1 MX records for this domain.
  • ✓ All hosts resolve #10
    All MX records resolve to valid IP addresses.
  • ✓ All hosts have IPv6 #11
    All MX records resolve to IPv6 addresses.
  • !
    Single MX host, no backup
    Only one MX record found. For better email reliability, consider adding at least one backup MX server.
    #12
  • ✓ At most 5 MX records #13
    Found 1 MX records, which is within the recommended range (1-5).
  • ✓ No localhost targets #14
    No MX records pointing to localhost found.
  • ✓ No private IP addresses #15
    No MX records resolving to private IP addresses found.
  • ✓ No CNAME targets #22
    No MX records point to a CNAME.
  • !
    Addresses without reverse DNS
    These MX addresses have no PTR record, which many receivers treat as a spam signal: 2a04:d480:4400:11:200:5eff:fe00:1e3 (merkurist-de.gate.seppmail.cloud). Ask your hosting provider to set one.
    #30

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 1 of 1 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
merkurist-de.gate.seppmail.cloud3 1 1 ec65f5c6ac784893…Yes

Checks

  • !
    Not configured
    MTA-STS is not configured, so other mail servers fall back to unencrypted delivery when TLS fails or is stripped by an attacker. Publish a _mta-sts TXT record and a policy at https://mta-sts.<domain>/.well-known/mta-sts.txt.
    #32
  • !
    Not configured
    MTA-STS or DANE is used without TLS-RPT, so you get no reports when senders fail to deliver because of TLS problems. Publish _smtp._tls TXT "v=TLSRPTv1; rua=mailto:...".
    #35
  • ✓ DANE on all MX hosts #36
    All 1 MX host publish DNSSEC-validated TLSA records.

BIMI

info

No BIMI record

Checks

  • i
    Not configured
    BIMI shows your logo next to your mail in supporting mail clients. It requires DMARC enforcement.
    #38