I'd highly recommend https://www.emailprivacytester.com/ https://www.emailprivacytester.com/ as well; it does a good job of testing if your email client leaks i

I'd highly recommend https://www.emailprivacytester.com/ https://www.emailprivacytester.com/ as well; it does a good job of testing if your email client leaks information about whether an email has been read. That demanding, presumptuous tone in an email is indeed a fast way to generate annoyance. With or without read-tracking, it's a bad approach to sales. I received mail via an address obviously obtained via a scraper or purchased spam list, with a subject of "quick call on Friday?". When that bait failed to work, they then had the audacity to send a mail asking for reasons for the lack of response, with such options as "I'm busy, reach out again in a month", or "I'm not the right person, but I've CCed another contact", etc. Naturally, there was no option for "You're a spammer and in an ideal world you'd go out of business". Ironically, it was a company offering lead generation and sales, so the fact that they're spamming is a very clear sign that their services are highly suspect. When I have the time and inclination, I go through the email headers of such mails, and report them to their mailing list service (some of them are very good about removing spammers), their hosting provider, their domain name provider, their email provider (gmail never seems to act on spam reports, but perhaps others might not be), and anyone else who might be able to stop the spam.