Lookup - SPF-Record

The BSI has been getting serious since August: Email Security Year 2025 – is your domain ready? SPF Check: gmx.ch

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2. Specify IP address (optional)

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What is the SPF lookup for?

With the SPF lookup you analyze the SPF record of a domain for errors, security risks and authorized IP addresses. Optionally, you can specify an IP address to check if it is authorized to send e-mail on behalf of the domain. The SPF lookup analyzes registered TXT records in real time. If you want to specify an SPF record manually, use the SPF Analyzer.

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SPF check passed

Your SPF record check result

• SPF record found
• Syntax check: 0 errors
• Email Anti-Spoofing: Good

Summary of the SPF check

Does a valid SPF record exist? An SPF record was found for the domain gmx.ch. The SPF record for gmx.ch is valid. The syntax check of the SPF record shows no obvious errors.

Which IP-s are legitimate to send emails? The SPF record contains a reference to external rules, which means that the validity of the SPF record depends on at least one other domain. A detailed list of the rules used externally can be found in the analysis result. In total, 26 IP address(es) were authorized by the SPF record to send emails.

The SPF record analysis was performed on 11.03.2026 at 06:51:58 clock.

Lookup for the domain: gmx.ch IP address to be checked: no IP address specified Change specifications ×

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Evaluation for the domain gmx.ch

Nameserverset: ns-gmx.ui-dns.biz ns-gmx.ui-dns.de ns-gmx.ui-dns.com ns-gmx.ui-dns.org Determined SPF record: v=spf1 redirect=_spf.gmx.net v=spf1 redirect=_spf.gmx.net Edit copy SPF Send Legitimated IP addresses: 26 IP addresses found

IP	Provider / ASN	DNSBL-Check
212.227.15.15	IONOS SE	blacklist
212.227.17.21	IONOS SE	blacklist
212.227.17.20	IONOS SE	blacklist
212.227.15.18	IONOS SE	blacklist
212.227.15.19	IONOS SE	blacklist
212.227.17.22	IONOS SE	blacklist
82.165.159.40	IONOS SE	blacklist
82.165.159.12	IONOS SE	blacklist
82.165.159.42	IONOS SE	blacklist
82.165.159.14	IONOS SE	blacklist
82.165.159.41	IONOS SE	blacklist
82.165.159.13	IONOS SE	blacklist
212.227.17.29	IONOS SE	blacklist
212.227.15.44	IONOS SE	blacklist
212.227.17.26	IONOS SE	blacklist
212.227.15.46	IONOS SE	blacklist
212.227.17.28	IONOS SE	blacklist
212.227.15.45	IONOS SE	blacklist
212.227.126.225	IONOS SE	blacklist
212.227.15.53	IONOS SE	blacklist
212.227.126.224	IONOS SE	blacklist
212.227.126.227	IONOS SE	blacklist
212.227.126.226	IONOS SE	blacklist
212.227.15.47	IONOS SE	blacklist
212.227.15.50	IONOS SE	blacklist
212.227.15.52	IONOS SE	blacklist

SPF-Syntax Check: Syntax check passed: 0 error

(gmx.ch → _spf.gmx.net) Mechanisms of SPF-Record are valid OK for 'v' -> 'spf1' OK for 'a' -> 'mout.gmx.net:' OK for 'a' -> 'mout-xforward.gmx.net:' OK for 'a' -> 'mout-bounce.gmx.net:' OK for 'a' -> 'mout-csbulk.1and1.com:' OK for 'a' -> 'mout-cscorp.1and1.com:' OK for 'all' -> '~'

(gmx.ch → _spf.gmx.net) The SPF consists of a permissible character set. The SPF record of _spf.gmx.net contains valid characters.

(gmx.ch) Mechanisms of SPF-Record are valid OK for 'v' -> 'spf1' OK for 'redirect' -> '_spf.gmx.net'

(gmx.ch) The DNS lookup limit was not exceeded. The limit was not exceeded: 1: gmx.ch include:_spf.gmx.net2: gmx.ch include:_spf.gmx.net - A3: gmx.ch include:_spf.gmx.net - A4: gmx.ch include:_spf.gmx.net - A5: gmx.ch include:_spf.gmx.net - A6: gmx.ch include:_spf.gmx.net - A

(gmx.ch) The SPF consists of a permissible character set. The SPF record of gmx.ch contains valid characters.

Loading... Check domain risks Secure domain risk management IT guide for free Analysis result of the SPF record for the domain: gmx.ch

SPF record available?

We found an SPF record for the domain.

v=spf1

Will be forwarded to another SPF record?

There is an SPF record that refers to another SPF record Additional entries in this record are therefore ignored.

➥ redirect:_spf.gmx.net v=spf1 a:mout.gmx.net a:mout-xforward.gmx.net a:mout-bounce.gmx.net a:mout-csbulk.1and1.com a:mout-cscorp.1and1.com ~all

Are the server addresses allowed to send e-mails?

In the SPF entry the mechanism 'a' has not been set.

Additionally authorized A-records?

In addition to the A-Records stored in the DNS, we could not find any other records authorized in the SPF-Record.

Are the registered mail servers allowed to send e-mails?

In the SPF entry the mechanism 'mx' has not been set

Additionally authorized MX records

We could not find any other records authorized in the SPF record besides the MX records stored in the DNS

Additionally authorized IPv4 addresses

No explicit IPv4 addresses in the SPF record have been authorised to send

Additionally authorized IPv6 addresses

No explicit IPv6 addresses in the SPF record have been authorised to send

Additional external SPF records

We could not find any other records authorized in SPF-Record

How is the sender informed?

The exp mechanism acts as a return to the sender if the IP address was not authorized to send and notify them. None was found.

PTR (obsolete mechanism)

The ptr mechanism is deprecated, slow and insecure and should not be used

PTR:

The ptr mechanism is deprecated, slow and insecure and should not be used

Authorize IP addresses with markers

When SPF is evaluated, macros can specifically authorize Ip addresses based on the request or connection of the user or client (RFC7208 )

E-Mail handling

How should the checkHost() function of the e-mail server handle the e-mail? (syntax )

Receiver address

analysis.ra-missing

Amount of reports

analysis.rp-missing

Report selection

analysis.rr-missing

Unknown mechanisms

No unknown mechanisms were found in the SPF record.

Recently performed SPF lookups

ycbg.de omnicom.at amtrade.com.au bertelsmann.de sw-schwetzingen.de parktherme.at architekten-k2.de loft-48.de juneapp.com pirojok.net

Server IP Address

We have determined the following IP address for the domain:

No domain specified

Reverse address

We have determined the following name for the server IP address:

redir-bs.web.de

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