Mailcastr - Create email signature that tells when your email is read.✉️
PixelBlock - Block email open tracking inside of Gmail
Ugly Email for FireFox - Get back your email privacy, block email tracking
Email Privacy Protector - Check the presence of email ids on your webpages using Email Privacy Checker tool and protect yourself from email spammers.
Mailintel - Analytics and reporting dashboard for transactional emails.
MailTrackerBlocker - Developer solving interesting problems with APIs. OSS contributor (Slim Framework, rst2pdf, OpenWhisk) & amateur photographer. He/him.