Email Security Hardening (SPF/DKIM/DMARC)
Stop attackers spoofing your domain and sharpen your defences against inbound phishing. We configure SPF, DKIM and DMARC correctly and tune your email security so criminals can't impersonate your brand.
Verified Solvex Specialist
Verified by SolvexDirect specialist contact for Solvex engagements
What this means. An authorized Solvex administrator registered and approved this exact public identity. What it does not. Solvex has not inspected the account on the platform, and this is not the platform's own verification.
Solvex specialists never ask for your passwords, recovery phrases, one-time codes, or payments to a personal account. Work, scope and invoices are agreed in writing through the official channels on this site.
Signed authorization required. This engagement is performed only against systems you own or are contractually authorized to have tested, under an agreed scope. See the responsible testing policy.
What's covered
- SPF, DKIM and DMARC assessment and configuration
- Move to DMARC enforcement (quarantine/reject) safely
- Inbound anti-phishing and anti-spoofing tuning
- MTA-STS and TLS-reporting setup
- Email-authentication monitoring and reporting
- Guidance for third-party senders
What you receive
- Email-authentication assessment
- Configured SPF/DKIM/DMARC records
- Enforcement roadmap and monitoring setup
- Documentation for ongoing management
- Optional follow-up review
Evidence and reporting
How the work is kept honest- Evidence, frozen at issuanceFindings tie to something observed. When the report is issued, the evidence behind it is frozen in the same transaction and cannot be edited afterwards.
- A signed reportAn Ed25519 signature covers both the report content and the delivered file. Alter a byte of either and verification fails.
- Signed scope firstTesting starts only after written scope and signed authorization for systems you own or are entitled to have tested.
Anyone holding a Solvex report can verify it publicly without seeing its contents.
Our boundaries
What this engagement does not do, stated before it starts.
- Only domains you own or control
- DNS changes made by you or with delegated authorisation
- Deliverability depends on your sending practices too
- Third-party sender configuration is guided, not managed
How this engagement runs
- 01
Intake
Tell us the system, the goal and the constraints. If the work is not a good fit, we say so before anyone is invoiced.
- 02
Scope and authorization
Written scope and signed authorization before anything is touched. Security testing runs only against systems you own or are contractually entitled to have tested.
- 03
Investigation or build
Specialists matched to the work. Findings are proven by hand — scanner output is a lead, never a finding.
- 04
Evidence
Every finding ties to something observed. When a report is issued, its evidence is frozen in the same transaction, so what backed the report cannot change afterwards.
- 05
Delivery
A signed report: an Ed25519 signature over both the content and the file, with a short verification reference you can read down a phone.
- 06
Verification and retest
Anyone holding the report can verify it publicly without seeing its contents. Fixes are retested as part of the engagement — “fixed” means we confirmed it.
Questions we are asked
- Will moving to DMARC enforcement block our legitimate email?
- Not if it's done properly. We move to enforcement gradually, using DMARC reports to confirm every legitimate sender is authenticated first, so real mail keeps flowing while spoofing is blocked.
- What do you need from us?
- Access to manage your DNS (or a delegated contact), a list of services that send email as your domain, and your current email platform details.
- Does this stop all phishing?
- It stops attackers spoofing your exact domain and strengthens inbound filtering. Combined with awareness training and simulations, it dramatically reduces email risk.
Related services
Offensive / Testing
Phishing Simulation Campaign
Most breaches start with an email. We run realistic, ethical phishing campaigns against your staff to measure real susceptibility and turn every click into a teachable moment — building a human firewall, not blame.
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