Une fois qu'on a bien transpiré et configuré proprement son [serveur de messagerie](https://fr.wikipedia.org/wiki/Serveur%20de%20messagerie%20%C3%A9lectronique "Consultez l'article "Serveur de messagerie électronique" de l'encyclopédie libre Wikipedia"), comment vérifier s'il marche ? En écrivant un message ? Cela ne teste que la moitié du trajet, il serait bien d'avoir aussi une réponse... Si on a des copains patients, on peut leur écrire et solliciter une réponse mais c'est assez abusif. Il vaut mieux compter sur un programme qui répondra à chaque fois, sans se lasser, et qui pourra en prime vous indiquer à quoi ressemblait le message entrant. Quelles sont les adresses qui correspondent à un tel programme ?

TIO is a family of online interpreters for an evergrowing list of practical and recreational programming languages.
To use TIO, simply click the arrow below, pick a programming language, and start typing. Once you click the run button, your code is sent to a TIO arena, executed in a sandboxed environment, and the results are sent back to your browser. You can share your code by generating a client-side permalink that encodes code and input directly in the URL.

A playground for jq

jq is like sed for JSON data - you can use it to slice and filter and map and transform structured data with the same ease that sed, awk, grep and friends let you play with text.

Solve real-world HTML, CSS and JavaScript challenges whilst working to professional designs. Join 673 197 developers building projects, reviewing code, and helping each other get better.

Find out if your website is Accessible and Compliant

Our free ADA and WCAG compliance checker identifies web accessibility issues and gives exact instructions for fixing them.

Outil d’analyse SEO

• Vérifiez l'aptitude de vos images au référencement
• Vérifiez les erreurs réseaux et HTTP
• Effectuez une analyse SEO instantanée de vos pages
• Sauvegardez vos rapports SEO
• Optimisez le référencement de votre site web gratuitement
• Déterminez les mots-clés les plus pertinents
• Comprenez comment Google voit votre site
• Vérifiez la cohérence de vos liens

uild Google searches in any combination of Google supported top level domain, country and language.
A tool for international SEOs

SEO-Hero gives your true position on Google in several datacenters.

See how your site performs, reveal why it's slow and discover optimization opportunities.

You can track historical performance of pages with a free GTmetrix account!

To test Linux Distros.

Should I Click is a free service to check if a website is safe to access. The great majority of attacks, including targeted attacks, start with a link in an email or chat. When you do not have enough time, or you do not know how to check the URL, should you click on it or not? Our Should I Click service could be helpful for you.

If you received a suspicious link or a website looks weird, Should I Click is the right and easy-to-use tool to analyse if it is safe to click. Should I Click uses a wide range of technologies, including machine learning, statistical analysis and security tools. The aim of this project is to help people at risk around the world (such as Journalists, NGOs, political activists) against targeted cyber attacks. However everyone can use this service.The shouldiclick.org project is a tool created in Civilsphere laboratory (https://www.civilsphereproject.org/) at the Czech Technical University in Prague to help to protect the civil society for free. This project is part of the diploma thesis of František Střasák that will be finished in May 2020.

Free website reputation checker tool lets you scan a website with multiple website reputation/blocklist services to check if the website is safe and legit or malicious. Check the online reputation of a website to better detect potentially malicious and scam websites.

Découvrez la puissance de Nmap pour l'analyse du réseau et l'audit de sécurité. Découvrez commandes et meilleures pratiques pour une analyse des vulnérabilités.

Currently, CryptCheck gives note from G for the worst sites to A+ for the best ones.

Scoring is based on the fact that TLS handshake is not authenticated, and so an attacker can force to use whatever cipher he wants as soon as both client and server support it, with a downgrade attack as simple as modify TCP packets on the fly.

Permet de tester pandoc.

“This tutorial explains how Nmap works and how to install and use it from the terminal.

Nmap (Network Mapper) is probably the most used network scan, at least among Linux users.”

❤️ Lightweight: Crafted with minimalistic UI design.

⚡️ Fast: Send requests and get/copy responses in real-time.

HTTP Methods

• GET - Requests retrieve resource information
• POST - The server creates a new entry in a database
• PUT - Updates an existing resource
• PATCH - Very similar to PUT but makes a partial update on a resource
• DELETE - Deletes resource or related component
• HEAD - Retrieve response headers identical to those of a GET request, but without the response body.
• CONNECT - Establishes a tunnel to the server identified by the target resource
• OPTIONS - Describe the communication options for the target resource
• TRACE - Performs a message loop-back test along the path to the target resource
• <custom> - Some APIs use custom request methods such as LIST. Type in your custom methods.

🌈 Make it yours: Customizable combinations for background, foreground, and accent colors — customize now.

Safely* install packages with npm or yarn by auditing them as part of your install process

Find and automatically fix vulnerabilities in your code, open source dependencies, containers, and infrastructure as code — all powered by Snyk’s industry-leading security intelligence.

Bitwarden is passionate about your online safety and we have provided a free password strength testing tool to help.

Others:

• zxcvbn tests (repository: dropboxzxcvbn Low-Budget Password Strength Estimation)