Email deliverability service: DNS + SPF + DKIM + DMARC

Struggling with email deliverability? Unlock the power of flawless delivery with our expert DNS, SPF, DKIM, and DMARC configuration services, both for hosted email and email marketing platforms.

There are a number of reasons why this may happen:

• Your email server is not properly configured.
• Your DNS and email server may not be sending the right information to other email servers, so they consider yours not trustworthy.
• Your email server may have been added to a spam black list.
• Your email messages may be malformed.
• You may have a history of poor email practices, which may have ruined your reputation as sender.

ASK FOR A QUOTE

We'll help you optimize your email infrastructure to meet the strictest standards of leading email providers like AWS SES, Google Cloud Platform, Azure, Hetzner, Host Europe, OVH, Sendinblue/Bravo, Mailerjet, Mailerlite, and more.

Embrace these benefits:

• Enhance deliverability rates and reach more subscribers
• Reduce spam complaints and improve sender reputation
• Protect your brand from email spoofing and phishing attacks

Partner with us today and experience the difference:

• Expert guidance from our team of email deliverability specialists
• Tailored solutions to fit your specific needs and platform
• Achieve inbox placement success and maximize your email marketing ROI

Don't let low deliverability hinder your email marketing efforts. Contact us today for a free consultation and unlock the key to email inbox dominance.

Working environment

These are the technologies we can help you with. Broadly, they are foundation technologies to deploy and operate Internet email servers.

How it works

• First, we assess your needs thoroughly—by discussing a few key questions with you and reviewing all relevant details. This ensures we fully grasp your requirements before tailoring a solution.
• We’ll provide you with a clear, detailed quote and transparent terms for the project—so you know exactly what to expect.
• Once you approve our quote, we’ll request a 50% deposit to secure your project and begin work promptly.
• We’ll carry out the work and provide you with a comprehensive report, outlining the system’s initial state, the actions we took, and the final results—so you have full visibility of the improvements made.
• Upon completion, we’ll issue the final invoice for the remaining 50%, payable once you’re satisfied with the results.

Who we are

We are Tarsis.net, a Spanish Internet agency with over 25 years of expertise in Linux system administration—covering deployment, configuration, security hardening, and ongoing maintenance. As an EU-registered intracommunity operator, we deliver reliable, compliant solutions tailored to your business needs.

We value lasting partnerships. Many of our clients have trusted us for years—even decades—and we take pride in building relationships that stand the test of time.

Frequently asked questions

Are you a company or a freelance?

Tarsis.net is a Spanish company, fully registered within the European Union as an intracommunity operator. Since 2000, we’ve been providing expert services to businesses and professionals across Europe.

Do you charge VAT?

Under EU regulations, VAT is not applied to transactions between businesses in different member states. If you’re based in, for example, Austria, your invoice will be VAT-free. However, if you’re hiring us from Spain, we are required to apply the current Spanish VAT rate in accordance with local tax law.

Do you have experience in X, Y or Z technology?

We specialise in a broad spectrum of technologies, but we only offer system administration services in areas where we excel. Unsure if we can assist with your project? Simply fill out our quote form, and we’ll promptly let you know how we can support your needs.

Why should I trust you for system administration?

For over 20 years, we’ve delivered expert installation, deployment, optimisation, security hardening, and maintenance of Linux systems for leading companies—including Indra, Telefónica, Motorola Solutions, and Konica Minolta.

Will we require administrative access to your server?

It depends on the project. We only request the access we absolutely need, operating strictly on a need-to-know basis. Once our work is complete, we’ll ask you to revoke any temporary credentials immediately—ensuring your security remains our top priority.

As a rule of thumb, if we don't need access to your system, we don't want to have it.

Do you handle urgent projects, and is there an additional cost?

We do accommodate rush jobs, but please note we are not a 24/7 emergency service. Here’s how it works:

• We’ll first assess your requirements and provide a detailed quote.
• Once we agree on the terms and pricing, we’ll begin work on your server.
• If prioritising your project requires us to reschedule other commitments, the urgency will be reflected in the quote.

Transparency and fairness are key—we’ll always discuss and agree on any adjustments upfront.

What payment methods do you accept? Do you accept cryptocurrency payments?

We accept SEPA bank transfers and Paypal. We do not accept cryptocurrencies at the moment, sorry.

Quote form

We need to know details about your project and its current status so that we can properly assess the situation. We know that filling out forms isn't everybody's favorite pastime, but please remember that having the right information up front will save you time in the long run.

This form will ask you for some contact information and some technical details about the characteristics of your system and various situations that may require sysadmin intervention. Thank you for taking the time to fill out the form as accurately as possible.

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Tarsis.net SL | VAT ID: ESB82698275
Vía Dos Castillas 33. Ática 4 B-A. 28224 Pozuelo de Alarcón (Madrid). Spain
Tel: +34 911 413 259 (9 am to 5 pm CET, Mon to Fri) | Fax: +34 911 410 179
https://www.tarsis.eu | info@tarsis.eu