I'll update this if I find more. For now, this seems to be a partial solution. It's a Gmail add on (except I don't use Gmail) that adds reminders. The options when setting reminders include cancelling it if someone replies, and to remind everyone in the thread. If you combine those two, it seems like — if you use Gmail's web client and have $23/month you're dying to get rid of — a decent way to add the feature. Source: over 1 year ago

Https://temp-mail.org/ Is one of the harder ones to block. The use unique domains with unique Mx records and cycle through ip addresses. All seem to be on digital ocean though. - Source: Hacker News / about 1 month ago

>I never ran into that problem with https://temp-mail.org. They cycle domains constantly. You didn't run into that problem with temp-mail.org because you happen to use them on websites that don't bother blocking disposable email addresses -- or -- they do try to block them but use simplistic domain name checks. But cycling domain names isn't enough to fool the more sophisticated disposable/throwaway email... - Source: Hacker News / about 1 month ago

> The problem with such services is, the moment they rear their heads just above the obscure line to even an iota of popularity, they get blocked, blacklisted and what not. I never ran into that problem with https://temp-mail.org. They cycle domains constantly. - Source: Hacker News / about 1 month ago

Just use a temporary email from some temporary email generator like https://temp-mail.org/ (use an AdBlock, I'm sure the site is littered with ads, but I wouldn't know cause I use uBlock). - Source: Hacker News / 7 months ago

You can use a disposable email https://temp-mail.org/ Or just maintain a personal throwaway email that's not tied to your real life identity. - Source: Hacker News / 7 months ago