If only he made that much effort to get Chromium to fix the issue. The source of the problem is with a dependency of the email clients, not the email clients themselves. He is bothering small free software projects so that those small free software projects ask Chromium to fix the issue.
For ends users, that's a distinction without a difference. Programmers are responsible for their choice of dependencies. If you've chosen to depend on it, it becomes your problem. Chromium is open source, no? So the email client programmer can fix that bug himself.