DMARC E-Mail-Provider Support

Welche Provider haben DMARC bereits vollständig implementiert?

Um seine volle Wirkung zu entfalten, erfordert DMARC eine korrekte Umsetzung der Richtlinien sowohl seitens des Senders als auch des Empfängers. Beim Empfang einer E-Mail muss der Mailserver die Domain des Senders (RFC5322.From) kontaktieren und den dort zur verfügung gestellten DMARC-Eintrag abfragen.

Hier sind die Ergebnisse unserer Überprüfung:

Provider (ESP) Spoofing Schutz
Eingehende E-Mails 		Spoofing Schutz
Ausgehende E-Mails 		Test Datum
GMX Freemail

❌ Spoofing Schutz

Smtp Response 
250 Requested mail action okay, completed: id=XXXXXX-XXXXXXXXXX-XXXXXX

❌

quarantine

gmx.de
gmx.at
gmx.ch
gmx.net
2023-10-02
Web.de

❌ Spoofing Schutz

Smtp Response 
250 Requested mail action okay, completed: id=XXXXXX-XXXXXXXXXX-XXXXXX

❌

quarantine

web.de
2023-10-02
freenet.de

❌ Spoofing Schutz

Smtp Response 
550 OK id=XXXXXX-XXXXXX-XX

❌

freenet.de
2023-10-02
t-online

❌ Spoofing Schutz

Smtp Response 
250 2.0.0 Message accepted.

❌

t-online.de
2023-10-04
Gmail

✅ Spoofing Schutz

Smtp Response 
550-5.7.26 Unauthenticated email from mailtower.app is not accepted due to
550-5.7.26 domain's DMARC policy. Please contact the administrator of
550-5.7.26 mailtower.app domain if this was a legitimate mail. Please visit
550-5.7.26  https://support.google.com/mail/answer/2451690 to learn about the
550 5.7.26 DMARC initiative. q4-20020ac25144000000b0050091d7a247si12472573lfd.375 - gsmtp

❌

gmail.com
2023-10-02
Outlook.com

✅ Spoofing Schutz

Smtp Response 
550 5.7.509 Access denied, sending domain [MAILTOWER.APP] does not pass DMARC verification and has a DMARC policy of reject. [PAXP189MB1552.EURP189.PROD.OUTLOOK.COM 2023-10-02T20:52:49.202Z 08DBC385DFC42BAB] [DUZPR01CA0060.eurprd01.prod.exchangelabs.com 2023-10-02T20:52:49.221Z 08DBC2F456218832] [DBAEUR03FT053.eop-EUR03.prod.protection.outlook.com 2023-10-02T20:52:49.211Z 08DBC297E2AB16E1]

❌

outlook.com
outlook.at
2023-10-02
Zoho

✅ Spoofing Schutz

Smtp Response 
550 5.7.1 Email rejected per DMARC policy for mailtower.app

✅

your.domain
2023-10-02
STRATO

✅ Spoofing Schutz

Smtp Response 
550 5.7.26 Message rejected per DMARC policy by mailtower.app

✅

your.domain
2023-10-02
Google Workspace

✅ Spoofing Schutz

Smtp Response 
550-5.7.26 Unauthenticated email from mailtower.app is not accepted due to
550-5.7.26 domain's DMARC policy. Please contact the administrator of
550-5.7.26 mailtower.app domain if this was a legitimate mail. Please visit
550-5.7.26  https://support.google.com/mail/answer/2451690 to learn about the
550 5.7.26 DMARC initiative. q4-20020ac25144000000b0050091d7a247si12472573lfd.375 - gsmtp

✅

your.domain
2023-10-02
Microsoft 365

✅ Spoofing Schutz

Die E-Mail wird erst in der zweiten Instanz abgefangen, und der Sender bekommt kein unmittelbares Feedback. Hierfür muss der Sender dann die Bounce-Mails auswerten.
Smtp Response 
550 5.7.509 Access denied, sending domain mailtower.app does not pass DMARC verification and has a DMARC policy of reject.

✅

your.domain
2023-10-02
Soverin

✅ Spoofing Schutz

Smtp Response 
554 5.7.1 Spam message rejected

✅

your.domain
2023-10-04