{"id":309,"date":"2026-08-28T12:35:40","date_gmt":"2026-08-28T10:35:40","guid":{"rendered":"https:\/\/staging.martrexo.com\/zustellbarkeit\/"},"modified":"2026-09-08T10:17:38","modified_gmt":"2026-09-08T08:17:38","slug":"deliverability-2","status":"publish","type":"page","link":"https:\/\/martrexo.com\/en\/zustellbarkeit\/","title":{"rendered":"Deliverability & Security"},"content":{"rendered":"
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Deliverability & Security<\/h1>

Our own gateways, proven reputation and award-winning security standards \u2013 so emails aren't just sent, but actually seen.<\/p>\n<\/div>

Discuss deliverability<\/a>Technical details<\/a><\/div><\/div><\/div><\/div>
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The problem: firewalls & security gateways<\/h2>\n<\/div><\/div>\n\n

Firewalls and security gateways check every email before it arrives.<\/strong><\/p>\n

What appears as delivered in your campaign reporting can still end up in quarantine on the receiving server \u2013 without ever showing up in your own metrics.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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Security gateways on the recipient side<\/h4>\n

Many companies place their own security gateways in front of the inbox, additionally checking every incoming email \u2013 independently of the mail provider.<\/p>\n<\/div><\/div>\n<\/div>\n\n

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Silent quarantine instead of a bounce<\/h4>\n

Emails classified as suspicious aren't rejected, but held back. There's no error message, just silence.<\/p>\n<\/div><\/div>\n<\/div>\n\n

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A blind spot in your own statistics<\/h4>\n

The dispatch report shows \u201cdelivered\u201d \u2013 whether the email actually lands in the inbox remains an open question.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n

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Deliverability as an achievement<\/h2>\n<\/div><\/div>\n\n

Deliverability doesn't happen by accident. It comes from infrastructure, certification and the ongoing upkeep of your own reputation.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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Our own gateways, worldwide dispatch<\/h4>\n

Dispatch via self-operated infrastructure \u2013 with no detour through third parties.<\/p>\n<\/div><\/div>\n<\/div>\n\n

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CSA Certified<\/h4>\n

Whitelisting on the Certified Senders Alliance list ensures preferential treatment with the major inbox providers.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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M3AAWG member<\/h4>\n

Active membership in the worldwide alliance against spam and abuse \u2013 a strong industry credential and commitment to email security best practices.<\/p>\n<\/div><\/div>\n<\/div>\n\n

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Reputation monitoring<\/h4>\n

Bounce and complaint management run continuously, so anomalies are spotted immediately.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n

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Authentication, briefly explained<\/h2>\n<\/div><\/div>\n\n

Technical signals decide whether an email is considered trustworthy. At martrexo, they're correctly set up and monitored from day one.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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SPF, DKIM, DMARC<\/h4>\n

The baseline authentication that proves: this email really does come from the stated sender.<\/p>\n<\/div><\/div>\n<\/div>\n\n

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MTA-STS & TLS<\/h4>\n

Encrypted transport between mail servers, enforced and secured.<\/p>\n<\/div><\/div>\n<\/div>\n\n

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DNSSEC<\/h4>\n

Secured DNS resolution \u2013 part of our commitment to the BSI guidelines (see Gold Status).<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n

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BSI Hall of Fame \u2013
Gold Status<\/h2>\n

Award-winning. Operated in Germany.<\/h3>\n<\/div><\/div>\n\n

martrexo has been recognized by BSI, Bitkom e. V.<\/strong> and eco e. V.<\/strong> in the Email Security Year with Gold Status<\/strong>, the highest level of the BSI Hall of Fame.<\/p>\n

Gold stands for the implementation of the Technical Guidelines TR-03108<\/strong> (Secure Email Transport) and TR-03182<\/strong> (Email Authentication), in particular the implementation of DNSSEC.<\/p>\n

In the same company as such renowned businesses as BASF, Porsche, Lufthansa and Deutsche Telekom.<\/p>\n<\/div><\/div>\n\n

More on the BSI page<\/a><\/div>\n<\/div>\n\n
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For IT<\/h2>\n<\/div><\/div>\n\n

Setup, operation and support are all taken care of for you \u2013 we handle the ongoing maintenance of the deliverability infrastructure.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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Setup<\/h4>\n

We help set up the DNS records and advise on deliverability issues from third-party systems.<\/p>\n<\/div><\/div>\n<\/div>\n\n

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Interfaces<\/h4>\n

Integration with websites, databases and CRM systems \u2013 additional effort is only required when a custom integration is needed.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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Single Sign-on<\/h4>\n

Available on request and included with the Connected tier and above.<\/p>\n<\/div><\/div>\n<\/div>\n\n

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Operations & maintenance<\/h4>\n

Ongoing maintenance, monitoring and updates of the deliverability infrastructure are handled by martrexo, not by your internal IT.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n

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Legal & data protection<\/h2>\n<\/div><\/div>\n\n

GDPR and BDSG-compliant, hosted in Germany. Double opt-in and audit-proof logging of all consents are standard, not an add-on.<\/p>\n<\/div><\/div>\n<\/div>\n\n

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\"DSGVO-konformer<\/span><\/div>\n<\/div>\n<\/div>\n\n
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Compliance<\/h4>\n

UWG-compliant, with a DPA and TOMs provided.<\/p>\n<\/div><\/div>\n<\/div>\n\n

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EU-First<\/h4>\n

Operations on our own infrastructure in Germany \u2013 data sovereignty is a key advantage.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n

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Support as a differentiator<\/h2>\n<\/div><\/div>\n\n

Real human support in every tier \u2013 no call centers, no bots. From the Engage tier onwards, a personal Customer Success Manager is on hand.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n

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Deliverability is no accident.<\/h1>\n<\/div><\/div>\n\n

Whether it's questions about your own deliverability or a look at the technical details \u2013 the next step is just one click away.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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Discuss deliverability<\/a><\/div>\n<\/div>\n\n
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View technical details<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-309","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/martrexo.com\/en\/wp-json\/wp\/v2\/pages\/309","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/martrexo.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/martrexo.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/martrexo.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/martrexo.com\/en\/wp-json\/wp\/v2\/comments?post=309"}],"version-history":[{"count":9,"href":"https:\/\/martrexo.com\/en\/wp-json\/wp\/v2\/pages\/309\/revisions"}],"predecessor-version":[{"id":554,"href":"https:\/\/martrexo.com\/en\/wp-json\/wp\/v2\/pages\/309\/revisions\/554"}],"wp:attachment":[{"href":"https:\/\/martrexo.com\/en\/wp-json\/wp\/v2\/media?parent=309"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}