Freelancer profile translated to English.
Back to original languageAbout Julien
👨💻 Expert in email deliverability and DNS management, I have been helping companies for almost 20 years in optimizing and securing their email, DNS, and domain name infrastructures.
💼 My Services
Email Deliverability and Reputation Audit and Optimization
• Resolving blocking issues (Mailer Daemon errors) and reputation problems (messages in SPAM).
• DMARC (SPF/DKIM) analysis and compliance to improve email reception (Google Workspace, Microsoft 365, Outlook, Orange, SFR, Free, Yahoo, etc.).
Secure Email Gateways (SEG)
• Audit, implementation, and management of Mimecast and Proofpoint solutions for mid-sized and large enterprises.
Configuration of Emailing/Newsletter, Transactional, and Cold Emailing Tools
• Configuration of Brevo (Brevo Expert Partner), Mailchimp, HubSpot, SendGrid, Klaviyo, Lemlist, ActiveCampaign platforms, etc.
• Campaign optimization, including cold emailing.
DNS and Domain Name Audit and Security
• DMARC, BIMI, DNSSEC, MTA-STS, TLS-RPT, DANE compliance, and best practices (RFC).
• Consolidation and transfer to a single provider (OVH, Gandi, Nameshield, etc.).
Email Service Migration
• Smooth and secure transition to Google Workspace, Microsoft 365, OVH, etc.
Email and DNS Infrastructure Audit
• Mapping of existing systems, correction of DNS configurations, and rationalization.
✨ My Deliverables
Each mission includes a detailed report with
• Complete technical analysis.
• Personalized recommendations to improve the deliverability, security, reputation, and effectiveness of your emails and infrastructures.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km)
Experience
- CaptainDNSFounder & DeveloperCONSULTING AND AUDITSAugust 2025 - Today (1 year)Paris, France
CaptainDNS - Online DNS & Email Tools Suite
CaptainDNS is a SaaS platform providing a suite of tools to diagnose, verify, and monitor DNS configurations and email authentication.DNS Tools- DNS Lookup: query all types of records (A, AAAA, MX, TXT, CNAME, NS, SOA, etc.)
- DNS Propagation Test: check resolution on a set of public resolvers worldwide
- DNS Monitoring: continuous monitoring of any record with alerts upon modification
Email Authentication Tools- SPF Verification: validate configuration and recursive resolution of includes
- DKIM Verification: check public keys and their validity
- DMARC Verification: analyze policy and consistency with SPF/DKIM
- BIMI Verification: check logo, VMC certificate, and DMARC prerequisites
- SPF, DKIM, DMARC, and BIMI syntax validators
Email Analysis Tools- Header Analyzer: decode email path, identify delays and intermediate servers
Other Tools- Whois Lookup
- Dangling DNS record detection
- DNS record generators
All tools are accessible online without installation, with an interface available in French, English, German, Spanish, Italian, and Portuguese. - MJQ SARLInformation Security Officer (CISO)CONSULTING AND AUDITSMarch 2011 - Today (15 years and 4 months)Paris, FranceDomain Names (DNS):
- Project to secure email and improve email deliverability, prevent spam, through: 'reject' DMARC policy / 'strict' SPF / MX / DKIM / BIMI
- Assistance in segmenting email sending tools to improve security and deliverability (brevo/sendinblue, hubspot, mailjet, mailchimp)
- Securing domain name portfolio: review DNS configuration, activate DNSSEC, implement CAA DNS entries, etc.
Decentralized Domain Names:- Assistance in registering and managing decentralized domain names with ENS (Ethereum Name Service), Unstoppable Domains (UD), DecentraWeb, etc.
- Deploying decentralized web pages
Reviews
Herve
Directeur Marketing - DIMO Software
Reviewed on 6/29/2026
Pro, efficace.
Laurent
Chef de Projet - ASSUDIKA
Reviewed on 4/27/2026
Très satisfait. Je recommande
Recommendations
EW
JK
+4
These freelancer profiles also match your criteria
Agatha Frydrych
Backend Java Software Engineer
4.7
(3)
2
Baptiste Duhen
Fullstack developer
4.6
(4)
5
Amed Hamou
Senior Lead Developer
4
(2)
7
Audrey Champion
Web developer
4.3
(3)
4
Education
- MBA Cybersecurity ManagementInstitut Léonard de Vinci2022Le MBA Management de la Cybersécurité permet l'apprentissage théorique et pratique de la maîtrise des données numériques. Il donne les clés d'un management opérationnel pour gérer et prévoir l'évolution des stratégies face aux risques techniques, aux enjeux concurrentiels et aux évolutions législatives et juridiques.
- Computer Engineering with a Software Engineering specializationINSIA (formerly Ingésup)2010