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MXToolbox tool for analyzing email headers, tracing message routes, and spotting delivery or authentication issues.

Email Privacy Tester is a privacy tool for blocking ads, trackers, popups, proxies, or unwanted web behavior.

OpenPGP Email Encryption is a privacy tool for blocking ads, trackers, popups, proxies, or unwanted web behavior.

Email alias service for creating forwarding addresses that protect your real inbox.

Open-source email alias service for receiving and replying without exposing a personal address, with apps, extensions, custom domains, and self-hosting support.

Dutch private email service with no advertising or profiling, unlimited aliases, spam protection, and PGP or password-protected messages.

Open source email verification service for checking syntax, MX records, and deliverability through an API.

Open source email client for managing mail, calendars, contacts, and add-ons across accounts.

CalidadTorrent is a non-English web resource for regional media, books, tools, communities, or learning.

Proton Calendar is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.

The National Do Not Call Registry is a mobile app resource for Android or iOS listings, app pages, updates, or community links.

/sport calendars/ is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.

acsm-calibre-plugin is a code project with source, releases, documentation, or setup notes.

Aqua Calc provides educational videos, lessons, tutorials, or self-learning resources.

Baking Calculators is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.

Calculator for working with very large integers used in cryptography, math, and technical checks.

Caffeine Calculator is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.

Cal.com is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.

Cal.com is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.

CalculateCGPA provides educational videos, lessons, tutorials, or self-learning resources.

Calculating Empires is an educational resource for documentaries, courses, books, reference material, or self-learning.

Calculator is a gaming resource for guides, communities, tools, game discovery, or reference links.

Calculus Made Easy is an educational resource for documentaries, courses, books, reference material, or self-learning.

calcurse is a Linux, macOS, BSD, or Unix resource for tools, documentation, communities, or system workflows.