Interesting to see some more responses to my original suggestion. Since I made it:
- Spamgourmet has ceased accepting new users as @kieran said. I also found a note about this on a spamgourmet-related forum somewhere. At some point it will shut down completely.
- A new service called Burner Mail has started up, although you need to go for the paid service to get more than 5 temporary addresses. The feature set for the paid service looks quite good.
- I found yet another similar service: E4ward. I have no idea who is behind it: it looks less slick than Blur or Burner Mail, but seems to have all the essential functionality.
Burner Mail and E4ward let you use a domain of your own, which is quite a good feature IMHO. It gives you some peace of mind: if they close down, then you can quickly set all e-mails to your domain to be forwarded to you while you sort something else out.
The downside of using your own domain is that it could weaken the anti-tracking side of things. In theory, someone could work out that you are the only person using that domain, and then track you on just the domain instead of the whole e-mail address.
OTOH, the downside of not using your own domain is that sooner or later companies that want to do tracking based on e-mail address will spot that a huge number of their users are creating accounts from the same domain, and may take action to block it. I can understand someone like Dropbox doing this - every new e-mail address is a claim on resources that they offer for free. I think (but I’m not sure) that Ryanair has done something similar, and that puzzles me: I would have thought that they would put as few obstacles as possible in the way of me buying plane tickets from them. It hardly seems likely that tracking their users by e-mail address is worth more to them than selling cheap flights (you have to provide a lot of identifying info to travel by air anyway), but you never know.
I have found with Blur that very occasionally there is a glitch: for a period of a few hours some e-mails get to the temporary mailbox, but then disappear, and some don’t even show up in the temporary mailbox. It has been a while since this happened to me, but it is one of the things that made me start thinking that Librem could offer a similar service. It could be integrated with their e-mail service, rather than being a separate add-on. I reckon that that way it could be made easy to use and very reliable, and also offer the use of custom domains for people who want them.